20078972665 has 16 divisors (see below), whose sum is σ = 25383899520. Its totient is φ = 15205155840.

The previous prime is 20078972659. The next prime is 20078972671. The reversal of 20078972665 is 56627987002.

It is an interprime number because it is at equal distance from previous prime (20078972659) and next prime (20078972671).

It is not a de Polignac number, because 20078972665 - 2²³ = 20070584057 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, 28780 + ... + 202450.

It is an arithmetic number, because the mean of its divisors is an integer number (1586493720).

Almost surely, 2^20078972665 is an apocalyptic number.

It is an amenable number.

20078972665 is a deficient number, since it is larger than the sum of its proper divisors (5304926855).

20078972665 is a wasteful number, since it uses less digits than its factorization.

20078972665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174912.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 20078972665 in words is "twenty billion, seventy-eight million, nine hundred seventy-two thousand, six hundred sixty-five".