64221632690 has 16 divisors (see below), whose sum is σ = 115848620928. Its totient is φ = 25633168176.

The previous prime is 64221632647. The next prime is 64221632693. The reversal of 64221632690 is 9623612246.

It is a super-2 number, since 2×64221632690² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64221632693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6930752 + ... + 6940011.

It is an arithmetic number, because the mean of its divisors is an integer number (7240538808).

Almost surely, 2^64221632690 is an apocalyptic number.

64221632690 is a deficient number, since it is larger than the sum of its proper divisors (51626988238).

64221632690 is a wasteful number, since it uses less digits than its factorization.

64221632690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13871233.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 64221632690 in words is "sixty-four billion, two hundred twenty-one million, six hundred thirty-two thousand, six hundred ninety".