155616561655616 has 28 divisors (see below), whose sum is σ = 314628060099492. Its totient is φ = 76340200055808.

The previous prime is 155616561655537. The next prime is 155616561655627. The reversal of 155616561655616 is 616556165616551.

It can be written as a sum of positive squares in 2 ways, for example, as 50898179415616 + 104718382240000 = 7134296^2 + 10233200^2 .

It is a super-2 number, since 2×155616561655616² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22938758645 + ... + 22938765428.

Almost surely, 2^{155616561655616} is an apocalyptic number.

155616561655616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155616561655616 is an abundant number, since it is smaller than the sum of its proper divisors (159011498443876).

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

155616561655616 is an equidigital number, since it uses as much as digits as its factorization.

155616561655616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45877524138 (or 45877524128 counting only the distinct ones).

The product of its digits is 145800000, while the sum is 65.

The spelling of 155616561655616 in words is "one hundred fifty-five trillion, six hundred sixteen billion, five hundred sixty-one million, six hundred fifty-five thousand, six hundred sixteen".