64400809537 has 8 divisors (see below), whose sum is σ = 64453939200. Its totient is φ = 64347706944.

The previous prime is 64400809507. The next prime is 64400809541. The reversal of 64400809537 is 73590800446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64400809537 - 2¹¹ = 64400807489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64400809507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8296264 + ... + 8304022.

It is an arithmetic number, because the mean of its divisors is an integer number (8056742400).

Almost surely, 2^64400809537 is an apocalyptic number.

It is an amenable number.

64400809537 is a deficient number, since it is larger than the sum of its proper divisors (53129663).

64400809537 is a wasteful number, since it uses less digits than its factorization.

64400809537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 64400809537 in words is "sixty-four billion, four hundred million, eight hundred nine thousand, five hundred thirty-seven".