127564640665 has 16 divisors (see below), whose sum is σ = 190849956480. Its totient is φ = 79520814720.

The previous prime is 127564640653. The next prime is 127564640729. The reversal of 127564640665 is 566046465721.

It is a happy number.

It is not a de Polignac number, because 127564640665 - 2¹³ = 127564632473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165667980 + ... + 165668749.

It is an arithmetic number, because the mean of its divisors is an integer number (11928122280).

Almost surely, 2^127564640665 is an apocalyptic number.

It is an amenable number.

127564640665 is a deficient number, since it is larger than the sum of its proper divisors (63285315815).

127564640665 is a wasteful number, since it uses less digits than its factorization.

127564640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331336752.

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 127564640665 in words is "one hundred twenty-seven billion, five hundred sixty-four million, six hundred forty thousand, six hundred sixty-five".