64693371137 has 4 divisors (see below), whose sum is σ = 64722293076. Its totient is φ = 64664449200.

The previous prime is 64693371103. The next prime is 64693371143. The reversal of 64693371137 is 73117339646.

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 22685179456 + 42008191681 = 150616^2 + 204959^2 .

It is a cyclic number.

It is not a de Polignac number, because 64693371137 - 2⁸ = 64693370881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64693379137) 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, 14457614 + ... + 14462087.

It is an arithmetic number, because the mean of its divisors is an integer number (16180573269).

Almost surely, 2^64693371137 is an apocalyptic number.

It is an amenable number.

64693371137 is a deficient number, since it is larger than the sum of its proper divisors (28921939).

64693371137 is a wasteful number, since it uses less digits than its factorization.

64693371137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28921938.

The product of its digits is 1714608, while the sum is 50.

The spelling of 64693371137 in words is "sixty-four billion, six hundred ninety-three million, three hundred seventy-one thousand, one hundred thirty-seven".