64400231165 has 4 divisors (see below), whose sum is σ = 77280277404. Its totient is φ = 51520184928.

The previous prime is 64400231143. The next prime is 64400231171. The reversal of 64400231165 is 56113200446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7186461529 + 57213769636 = 84773^2 + 239194^2 .

It is a cyclic number.

It is not a de Polignac number, because 64400231165 - 2¹⁸ = 64399969021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6440023112 + ... + 6440023121.

It is an arithmetic number, because the mean of its divisors is an integer number (19320069351).

Almost surely, 2^64400231165 is an apocalyptic number.

It is an amenable number.

64400231165 is a deficient number, since it is larger than the sum of its proper divisors (12880046239).

64400231165 is a wasteful number, since it uses less digits than its factorization.

64400231165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880046238.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 64400231165 in words is "sixty-four billion, four hundred million, two hundred thirty-one thousand, one hundred sixty-five".