646462122621 has 16 divisors (see below), whose sum is σ = 985336754304. Its totient is φ = 369312571584.

The previous prime is 646462122589. The next prime is 646462122623. The reversal of 646462122621 is 126221264646.

It is not a de Polignac number, because 646462122621 - 2⁵ = 646462122589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646462122623) 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, 3847270 + ... + 4011783.

It is an arithmetic number, because the mean of its divisors is an integer number (61583547144).

Almost surely, 2^646462122621 is an apocalyptic number.

It is an amenable number.

646462122621 is a deficient number, since it is larger than the sum of its proper divisors (338874631683).

646462122621 is a wasteful number, since it uses less digits than its factorization.

646462122621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7862980.

The product of its digits is 331776, while the sum is 42.

The spelling of 646462122621 in words is "six hundred forty-six billion, four hundred sixty-two million, one hundred twenty-two thousand, six hundred twenty-one".