1556501166 has 144 divisors (see below), whose sum is σ = 4039635600. Its totient is φ = 431101440.

The previous prime is 1556501159. The next prime is 1556501173. The reversal of 1556501166 is 6611056551.

It is an interprime number because it is at equal distance from previous prime (1556501159) and next prime (1556501173).

It is a self number, because there is not a number n which added to its sum of digits gives 1556501166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1199430 + ... + 1200726.

It is an arithmetic number, because the mean of its divisors is an integer number (28053025).

Almost surely, 2^1556501166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556501166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2019817800).

1556501166 is an abundant number, since it is smaller than the sum of its proper divisors (2483134434).

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

1556501166 is a wasteful number, since it uses less digits than its factorization.

1556501166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375 (or 1361 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1556501166 is about 39452.5178664176. The cubic root of 1556501166 is about 1158.9102841015.

It can be divided in two parts, 155650 and 1166, that added together give a square (156816 = 396²).

The spelling of 1556501166 in words is "one billion, five hundred fifty-six million, five hundred one thousand, one hundred sixty-six".