55001551556 has 18 divisors (see below), whose sum is σ = 111967444638. Its totient is φ = 23572093440.

The previous prime is 55001551543. The next prime is 55001551559. The reversal of 55001551556 is 65515510055.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50427193600 + 4574357956 = 224560^2 + 67634^2 .

It is a super-2 number, since 2×55001551556² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55001551559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140309885 + ... + 140310276.

It is an arithmetic number, because the mean of its divisors is an integer number (6220413591).

Almost surely, 2^55001551556 is an apocalyptic number.

It is an amenable number.

55001551556 is an abundant number, since it is smaller than the sum of its proper divisors (56965893082).

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

55001551556 is a wasteful number, since it uses less digits than its factorization.

55001551556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280620179 (or 280620170 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 55001551556 in words is "fifty-five billion, one million, five hundred fifty-one thousand, five hundred fifty-six".