661118475 has 12 divisors (see below), whose sum is σ = 1093049336. Its totient is φ = 352596480.

The previous prime is 661118473. The next prime is 661118483. The reversal of 661118475 is 574811166.

It is not a de Polignac number, because 661118475 - 2¹ = 661118473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661118473) 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, 4407382 + ... + 4407531.

Almost surely, 2^661118475 is an apocalyptic number.

661118475 is a deficient number, since it is larger than the sum of its proper divisors (431930861).

661118475 is a wasteful number, since it uses less digits than its factorization.

661118475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8814926 (or 8814921 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 661118475 is about 25712.2242328430. The cubic root of 661118475 is about 871.1503148204.

The spelling of 661118475 in words is "six hundred sixty-one million, one hundred eighteen thousand, four hundred seventy-five".