64364040731 has 4 divisors (see below), whose sum is σ = 68150160792. Its totient is φ = 60577920672.

The previous prime is 64364040709. The next prime is 64364040761. The reversal of 64364040731 is 13704046346.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64364040731 - 2³⁴ = 47184171547 is a prime.

It is a super-2 number, since 2×64364040731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64364040701) 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, 1893060005 + ... + 1893060038.

It is an arithmetic number, because the mean of its divisors is an integer number (17037540198).

Almost surely, 2^64364040731 is an apocalyptic number.

64364040731 is a deficient number, since it is larger than the sum of its proper divisors (3786120061).

64364040731 is a wasteful number, since it uses less digits than its factorization.

64364040731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786120060.

The product of its (nonzero) digits is 145152, while the sum is 38.

The spelling of 64364040731 in words is "sixty-four billion, three hundred sixty-four million, forty thousand, seven hundred thirty-one".