64254904921 has 8 divisors (see below), whose sum is σ = 65199737960. Its totient is φ = 63311818752.

The previous prime is 64254904907. The next prime is 64254904943. The reversal of 64254904921 is 12940945246.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7839154521 + 56415750400 = 88539^2 + 237520^2 .

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 64254904921 - 2⁷ = 64254904793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64254904951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362520 + ... + 509833.

It is an arithmetic number, because the mean of its divisors is an integer number (8149967245).

Almost surely, 2^64254904921 is an apocalyptic number.

It is an amenable number.

64254904921 is a deficient number, since it is larger than the sum of its proper divisors (944833039).

64254904921 is a wasteful number, since it uses less digits than its factorization.

64254904921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873435.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 64254904921 in words is "sixty-four billion, two hundred fifty-four million, nine hundred four thousand, nine hundred twenty-one".