55505475665 has 32 divisors (see below), whose sum is σ = 69668121600. Its totient is φ = 42404256000.

The previous prime is 55505475661. The next prime is 55505475671. The reversal of 55505475665 is 56657450555.

It is not a de Polignac number, because 55505475665 - 2² = 55505475661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55505475661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4800311 + ... + 4811859.

It is an arithmetic number, because the mean of its divisors is an integer number (2177128800).

Almost surely, 2^55505475665 is an apocalyptic number.

It is an amenable number.

55505475665 is a deficient number, since it is larger than the sum of its proper divisors (14162645935).

55505475665 is a wasteful number, since it uses less digits than its factorization.

55505475665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11993.

The product of its (nonzero) digits is 15750000, while the sum is 53.

The spelling of 55505475665 in words is "fifty-five billion, five hundred five million, four hundred seventy-five thousand, six hundred sixty-five".