64665072051 has 4 divisors (see below), whose sum is σ = 86220096072. Its totient is φ = 43110048032.

The previous prime is 64665072049. The next prime is 64665072053. The reversal of 64665072051 is 15027056646.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64665072049) and next prime (64665072053).

It is a cyclic number.

It is not a de Polignac number, because 64665072051 - 2¹ = 64665072049 is a prime.

It is a super-2 number, since 2×64665072051² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64665071994 and 64665072012.

It is not an unprimeable number, because it can be changed into a prime (64665072053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10777512006 + ... + 10777512011.

It is an arithmetic number, because the mean of its divisors is an integer number (21555024018).

Almost surely, 2^64665072051 is an apocalyptic number.

64665072051 is a deficient number, since it is larger than the sum of its proper divisors (21555024021).

64665072051 is a wasteful number, since it uses less digits than its factorization.

64665072051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21555024020.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 64665072051 in words is "sixty-four billion, six hundred sixty-five million, seventy-two thousand, fifty-one".