64461137421 has 8 divisors (see below), whose sum is σ = 91003958784. Its totient is φ = 40446203840.

The previous prime is 64461137413. The next prime is 64461137441. The reversal of 64461137421 is 12473116446.

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 64461137421 - 2³ = 64461137413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64461137421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64461137441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631971885 + ... + 631971986.

It is an arithmetic number, because the mean of its divisors is an integer number (11375494848).

Almost surely, 2^64461137421 is an apocalyptic number.

It is an amenable number.

64461137421 is a deficient number, since it is larger than the sum of its proper divisors (26542821363).

64461137421 is a wasteful number, since it uses less digits than its factorization.

64461137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263943891.

The product of its digits is 96768, while the sum is 39.

The spelling of 64461137421 in words is "sixty-four billion, four hundred sixty-one million, one hundred thirty-seven thousand, four hundred twenty-one".