64431213446 has 4 divisors (see below), whose sum is σ = 96646820172. Its totient is φ = 32215606722.

The previous prime is 64431213437. The next prime is 64431213467.

64431213446 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×64431213446² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16107803360 + ... + 16107803363.

It is an arithmetic number, because the mean of its divisors is an integer number (24161705043).

Almost surely, 2^64431213446 is an apocalyptic number.

64431213446 is a deficient number, since it is larger than the sum of its proper divisors (32215606726).

64431213446 is a wasteful number, since it uses less digits than its factorization.

64431213446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32215606725.

The product of its digits is 165888, while the sum is 38.

The spelling of 64431213446 in words is "sixty-four billion, four hundred thirty-one million, two hundred thirteen thousand, four hundred forty-six".