661265235365064 has 64 divisors (see below), whose sum is σ = 1823714132328000. Its totient is φ = 198131905720320.

The previous prime is 661265235365057. The next prime is 661265235365093. The reversal of 661265235365064 is 460563532562166.

It is a junction number, because it is equal to n+sod(n) for n = 661265235364989 and 661265235365007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14071844809 + ... + 14071891800.

It is an arithmetic number, because the mean of its divisors is an integer number (28495533317625).

Almost surely, 2^{661265235365064} is an apocalyptic number.

It is an amenable number.

661265235365064 is an abundant number, since it is smaller than the sum of its proper divisors (1162448896962936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661265235365064 is a wasteful number, since it uses less digits than its factorization.

661265235365064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28143736718 (or 28143736714 counting only the distinct ones).

The product of its (nonzero) digits is 139968000, while the sum is 60.

The spelling of 661265235365064 in words is "six hundred sixty-one trillion, two hundred sixty-five billion, two hundred thirty-five million, three hundred sixty-five thousand, sixty-four".