664755557465 has 8 divisors (see below), whose sum is σ = 797718414528. Its totient is φ = 531796615600.

The previous prime is 664755557399. The next prime is 664755557497. The reversal of 664755557465 is 564755557466.

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

It is not a de Polignac number, because 664755557465 - 2³⁸ = 389877650521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591317 + ... + 1295826.

It is an arithmetic number, because the mean of its divisors is an integer number (99714801816).

Almost surely, 2^664755557465 is an apocalyptic number.

It is an amenable number.

664755557465 is a deficient number, since it is larger than the sum of its proper divisors (132962857063).

664755557465 is a wasteful number, since it uses less digits than its factorization.

664755557465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957599.

The product of its digits is 529200000, while the sum is 65.

Subtracting from 664755557465 its reverse (564755557466), we obtain a palindrome (99999999999).

The spelling of 664755557465 in words is "six hundred sixty-four billion, seven hundred fifty-five million, five hundred fifty-seven thousand, four hundred sixty-five".