55390317666 has 32 divisors (see below), whose sum is σ = 115425172800. Its totient is φ = 17698511040.

The previous prime is 55390317629. The next prime is 55390317667. The reversal of 55390317666 is 66671309355.

It is a super-2 number, since 2×55390317666² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55390317667) 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, 1120905 + ... + 1169276.

It is an arithmetic number, because the mean of its divisors is an integer number (3607036650).

Almost surely, 2^55390317666 is an apocalyptic number.

55390317666 is an abundant number, since it is smaller than the sum of its proper divisors (60034855134).

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

55390317666 is a wasteful number, since it uses less digits than its factorization.

55390317666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290354.

The product of its (nonzero) digits is 3061800, while the sum is 51.

The spelling of 55390317666 in words is "fifty-five billion, three hundred ninety million, three hundred seventeen thousand, six hundred sixty-six".