64515919752441 has 24 divisors (see below), whose sum is σ = 93208313297736. Its totient is φ = 43002005798400.

The previous prime is 64515919752433. The next prime is 64515919752491. The reversal of 64515919752441 is 14425791951546.

64515919752441 is a `hidden beast` number, since 6 + 4 + 5 + 1 + 59 + 1 + 97 + 52 + 441 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4319347516416 + 60196572236025 = 2078304^2 + 7758645^2 .

It is not a de Polignac number, because 64515919752441 - 2³ = 64515919752433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64515919752491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1073428291 + ... + 1073488391.

It is an arithmetic number, because the mean of its divisors is an integer number (3883679720739).

Almost surely, 2^{64515919752441} is an apocalyptic number.

It is an amenable number.

64515919752441 is a deficient number, since it is larger than the sum of its proper divisors (28692393545295).

64515919752441 is a wasteful number, since it uses less digits than its factorization.

64515919752441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81993 (or 81990 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 63.

The spelling of 64515919752441 in words is "sixty-four trillion, five hundred fifteen billion, nine hundred nineteen million, seven hundred fifty-two thousand, four hundred forty-one".