661459475 has 12 divisors (see below), whose sum is σ = 820978704. Its totient is φ = 528671520.

The previous prime is 661459459. The next prime is 661459499. The reversal of 661459475 is 574954166.

It is not a de Polignac number, because 661459475 - 2⁴ = 661459459 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16082 + ... + 39768.

It is an arithmetic number, because the mean of its divisors is an integer number (68414892).

Almost surely, 2^661459475 is an apocalyptic number.

661459475 is a deficient number, since it is larger than the sum of its proper divisors (159519229).

661459475 is a wasteful number, since it uses less digits than its factorization.

661459475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24814 (or 24809 counting only the distinct ones).

The product of its digits is 907200, while the sum is 47.

The square root of 661459475 is about 25718.8544651584. The cubic root of 661459475 is about 871.3000666975.

It can be divided in two parts, 66 and 1459475, that added together give a palindrome (1459541).

The spelling of 661459475 in words is "six hundred sixty-one million, four hundred fifty-nine thousand, four hundred seventy-five".