665651055157 has 16 divisors (see below), whose sum is σ = 774934566912. Its totient is φ = 565056414720.

The previous prime is 665651055151. The next prime is 665651055281. The reversal of 665651055157 is 751550156566.

It is a cyclic number.

It is not a de Polignac number, because 665651055157 - 2¹⁵ = 665651022389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665651055151) 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, 13990548 + ... + 14038045.

It is an arithmetic number, because the mean of its divisors is an integer number (48433410432).

Almost surely, 2^665651055157 is an apocalyptic number.

It is an amenable number.

665651055157 is a deficient number, since it is larger than the sum of its proper divisors (109283511755).

665651055157 is a wasteful number, since it uses less digits than its factorization.

665651055157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28028748.

The product of its (nonzero) digits is 4725000, while the sum is 52.

The spelling of 665651055157 in words is "six hundred sixty-five billion, six hundred fifty-one million, fifty-five thousand, one hundred fifty-seven".