661012475 has 12 divisors (see below), whose sum is σ = 820177416. Its totient is φ = 528473280.

The previous prime is 661012463. The next prime is 661012477. The reversal of 661012475 is 574210166.

It is a de Polignac number, because none of the positive numbers 2^k-661012475 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661012477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36284 + ... + 51366.

It is an arithmetic number, because the mean of its divisors is an integer number (68348118).

Almost surely, 2^661012475 is an apocalyptic number.

661012475 is a deficient number, since it is larger than the sum of its proper divisors (159164941).

661012475 is a wasteful number, since it uses less digits than its factorization.

661012475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16846 (or 16841 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 661012475 is about 25710.1628738520. The cubic root of 661012475 is about 871.1037538925.

The spelling of 661012475 in words is "six hundred sixty-one million, twelve thousand, four hundred seventy-five".