64120000665 has 64 divisors (see below), whose sum is σ = 125122904064. Its totient is φ = 27370441728.

The previous prime is 64120000661. The next prime is 64120000673. The reversal of 64120000665 is 56600002146.

64120000665 = 14110² + 14111² + ... + 14424².

It is not a de Polignac number, because 64120000665 - 2² = 64120000661 is a prime.

It is a super-2 number, since 2×64120000665² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64120000661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85272 + ... + 368118.

It is an arithmetic number, because the mean of its divisors is an integer number (1955045376).

Almost surely, 2^64120000665 is an apocalyptic number.

It is an amenable number.

64120000665 is a deficient number, since it is larger than the sum of its proper divisors (61002903399).

64120000665 is a wasteful number, since it uses less digits than its factorization.

64120000665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283006.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 64120000665 in words is "sixty-four billion, one hundred twenty million, six hundred sixty-five", and thus it is an aban number.