64881460308457 has 4 divisors (see below), whose sum is σ = 69872341870660. Its totient is φ = 59890578746256.

The previous prime is 64881460308451. The next prime is 64881460308463. The reversal of 64881460308457 is 75480306418846.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64881460308451) and next prime (64881460308463).

It can be written as a sum of positive squares in 2 ways, for example, as 19353567734361 + 45527892574096 = 4399269^2 + 6747436^2 .

It is a cyclic number.

It is not a de Polignac number, because 64881460308457 - 2¹⁵ = 64881460275689 is a prime.

It is a super-2 number, since 2×64881460308457² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64881460308451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495440781082 + ... + 2495440781107.

It is an arithmetic number, because the mean of its divisors is an integer number (17468085467665).

Almost surely, 2^{64881460308457} is an apocalyptic number.

It is an amenable number.

64881460308457 is a deficient number, since it is larger than the sum of its proper divisors (4990881562203).

64881460308457 is a wasteful number, since it uses less digits than its factorization.

64881460308457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4990881562202.

The product of its (nonzero) digits is 123863040, while the sum is 64.

The spelling of 64881460308457 in words is "sixty-four trillion, eight hundred eighty-one billion, four hundred sixty million, three hundred eight thousand, four hundred fifty-seven".