55555550001 has 16 divisors (see below), whose sum is σ = 94062307200. Its totient is φ = 31746028464.

The previous prime is 55555549997. The next prime is 55555550033. The reversal of 55555550001 is 10005555555.

It is a happy number.

55555550001 is a `hidden beast` number, since 5 + 55 + 55 + 550 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 55555550001 - 2² = 55555549997 is a prime.

It is a super-2 number, since 2×55555550001² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55555550101) 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, 146972166 + ... + 146972543.

It is an arithmetic number, because the mean of its divisors is an integer number (5878894200).

Almost surely, 2^55555550001 is an apocalyptic number.

It is an amenable number.

55555550001 is a deficient number, since it is larger than the sum of its proper divisors (38506757199).

55555550001 is a wasteful number, since it uses less digits than its factorization.

55555550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293944725 (or 293944719 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 36.

The spelling of 55555550001 in words is "fifty-five billion, five hundred fifty-five million, five hundred fifty thousand, one".