1556416620 has 240 divisors, whose sum is σ = 5368543488. Its totient is φ = 374336640.

The previous prime is 1556416607. The next prime is 1556416643. The reversal of 1556416620 is 266146551.

1556416620 is a `hidden beast` number, since 1 + 5 + 5 + 641 + 6 + 6 + 2 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2975679 + ... + 2976201.

Almost surely, 2^1556416620 is an apocalyptic number.

1556416620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556416620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2684271744).

1556416620 is an abundant number, since it is smaller than the sum of its proper divisors (3812126868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1556416620 is a wasteful number, since it uses less digits than its factorization.

1556416620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1556416620 is about 39451.4463613186. The cubic root of 1556416620 is about 1158.8893004995.

It can be divided in two parts, 155641 and 6620, that added together give a palindrome (162261).

The spelling of 1556416620 in words is "one billion, five hundred fifty-six million, four hundred sixteen thousand, six hundred twenty".