155566665552 has 40 divisors (see below), whose sum is σ = 401917311360. Its totient is φ = 51850812160.

The previous prime is 155566665521. The next prime is 155566665563. The reversal of 155566665552 is 255566665551.

It is a junction number, because it is equal to n+sod(n) for n = 155566665492 and 155566665501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403177 + ... + 688247.

It is an arithmetic number, because the mean of its divisors is an integer number (10047932784).

Almost surely, 2^155566665552 is an apocalyptic number.

155566665552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155566665552 is an abundant number, since it is smaller than the sum of its proper divisors (246350645808).

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

155566665552 is a wasteful number, since it uses less digits than its factorization.

155566665552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296451 (or 296445 counting only the distinct ones).

The product of its digits is 40500000, while the sum is 57.

Subtracting 155566665552 from its reverse (255566665551), we obtain a palindrome (99999999999).

The spelling of 155566665552 in words is "one hundred fifty-five billion, five hundred sixty-six million, six hundred sixty-five thousand, five hundred fifty-two".