64121212664 has 8 divisors (see below), whose sum is σ = 120227273760. Its totient is φ = 32060606328.

The previous prime is 64121212657. The next prime is 64121212679. The reversal of 64121212664 is 46621212146.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×64121212664² (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, 4007575784 + ... + 4007575799.

It is an arithmetic number, because the mean of its divisors is an integer number (15028409220).

Almost surely, 2^64121212664 is an apocalyptic number.

It is an amenable number.

64121212664 is a deficient number, since it is larger than the sum of its proper divisors (56106061096).

64121212664 is a wasteful number, since it uses less digits than its factorization.

64121212664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8015151589 (or 8015151585 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The spelling of 64121212664 in words is "sixty-four billion, one hundred twenty-one million, two hundred twelve thousand, six hundred sixty-four".