64431461699 has 24 divisors (see below), whose sum is σ = 71951791296. Its totient is φ = 57642710400.

The previous prime is 64431461639. The next prime is 64431461729. The reversal of 64431461699 is 99616413446.

It is a happy number.

It is not a de Polignac number, because 64431461699 - 2⁸ = 64431461443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64431461699.

It is not an unprimeable number, because it can be changed into a prime (64431461639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4064102 + ... + 4079924.

It is an arithmetic number, because the mean of its divisors is an integer number (2997991304).

Almost surely, 2^64431461699 is an apocalyptic number.

64431461699 is a deficient number, since it is larger than the sum of its proper divisors (7520329597).

64431461699 is a wasteful number, since it uses less digits than its factorization.

64431461699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16379 (or 16368 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The spelling of 64431461699 in words is "sixty-four billion, four hundred thirty-one million, four hundred sixty-one thousand, six hundred ninety-nine".