155665615056 has 80 divisors (see below), whose sum is σ = 460161631104. Its totient is φ = 44420009472.

The previous prime is 155665615009. The next prime is 155665615057. The reversal of 155665615056 is 650516566551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155665615057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22855 + ... + 558438.

Almost surely, 2^155665615056 is an apocalyptic number.

155665615056 is a gapful number since it is divisible by the number (16) 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 155665615056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230080815552).

155665615056 is an abundant number, since it is smaller than the sum of its proper divisors (304496016048).

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

155665615056 is a wasteful number, since it uses less digits than its factorization.

155665615056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582108 (or 582102 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 155665615056 in words is "one hundred fifty-five billion, six hundred sixty-five million, six hundred fifteen thousand, fifty-six".