661607575 has 12 divisors (see below), whose sum is σ = 823363720. Its totient is φ = 527369760.

The previous prime is 661607501. The next prime is 661607587. The reversal of 661607575 is 575706166.

It is not a de Polignac number, because 661607575 - 2¹⁷ = 661476503 is a prime.

It is a congruent 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, 40845 + ... + 54694.

Almost surely, 2^661607575 is an apocalyptic number.

661607575 is a deficient number, since it is larger than the sum of its proper divisors (161756145).

661607575 is a wasteful number, since it uses less digits than its factorization.

661607575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95826 (or 95821 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 661607575 is about 25721.7335146759. The cubic root of 661607575 is about 871.3650895323.

The spelling of 661607575 in words is "six hundred sixty-one million, six hundred seven thousand, five hundred seventy-five".