64220532961 has 8 divisors (see below), whose sum is σ = 69845333544. Its totient is φ = 58693555200.

The previous prime is 64220532913. The next prime is 64220532991. The reversal of 64220532961 is 16923502246.

It can be written as a sum of positive squares in 4 ways, for example, as 14956067025 + 49264465936 = 122295^2 + 221956^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64220532961 - 2⁷ = 64220532833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64220532991) 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, 24454336 + ... + 24456961.

It is an arithmetic number, because the mean of its divisors is an integer number (8730666693).

Almost surely, 2^64220532961 is an apocalyptic number.

It is an amenable number.

64220532961 is a deficient number, since it is larger than the sum of its proper divisors (5624800583).

64220532961 is a wasteful number, since it uses less digits than its factorization.

64220532961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48911411.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 64220532961 in words is "sixty-four billion, two hundred twenty million, five hundred thirty-two thousand, nine hundred sixty-one".