155661443631512 has 512 divisors, whose sum is σ = 399562058649600. Its totient is φ = 55065036128256.

The previous prime is 155661443631511. The next prime is 155661443631521. The reversal of 155661443631512 is 215136344166551.

It is a super-2 number, since 2×155661443631512² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155661443631511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 81370330268 + ... + 81370332180.

It is an arithmetic number, because the mean of its divisors is an integer number (780394645800).

Almost surely, 2^{155661443631512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155661443631512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199781029324800).

155661443631512 is an abundant number, since it is smaller than the sum of its proper divisors (243900615018088).

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

155661443631512 is a wasteful number, since it uses less digits than its factorization.

155661443631512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755 (or 3751 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 53.

The spelling of 155661443631512 in words is "one hundred fifty-five trillion, six hundred sixty-one billion, four hundred forty-three million, six hundred thirty-one thousand, five hundred twelve".