1616121556 has 24 divisors (see below), whose sum is σ = 3285234176. Its totient is φ = 681268320.

The previous prime is 1616121553. The next prime is 1616121583. The reversal of 1616121556 is 6551216161.

It is a super-2 number, since 2×1616121556² = 5223697767535722272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616121553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471396 + ... + 474811.

Almost surely, 2^1616121556 is an apocalyptic number.

It is an amenable number.

1616121556 is an abundant number, since it is smaller than the sum of its proper divisors (1669112620).

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

1616121556 is a wasteful number, since it uses less digits than its factorization.

1616121556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946279 (or 946277 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 1616121556 is about 40201.0143653117. The cubic root of 1616121556 is about 1173.5222844447.

The spelling of 1616121556 in words is "one billion, six hundred sixteen million, one hundred twenty-one thousand, five hundred fifty-six".