64667396331 has 16 divisors (see below), whose sum is σ = 96957813120. Its totient is φ = 42592179240.

The previous prime is 64667396317. The next prime is 64667396341. The reversal of 64667396331 is 13369376646.

It is not a de Polignac number, because 64667396331 - 2¹¹ = 64667394283 is a prime.

It is a super-2 number, since 2×64667396331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64667396341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14426005 + ... + 14430486.

It is an arithmetic number, because the mean of its divisors is an integer number (6059863320).

Almost surely, 2^64667396331 is an apocalyptic number.

64667396331 is a deficient number, since it is larger than the sum of its proper divisors (32290416789).

64667396331 is a wasteful number, since it uses less digits than its factorization.

64667396331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28856583 (or 28856577 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 54.

The spelling of 64667396331 in words is "sixty-four billion, six hundred sixty-seven million, three hundred ninety-six thousand, three hundred thirty-one".