661151575 has 24 divisors (see below), whose sum is σ = 938193920. Its totient is φ = 452757600.

The previous prime is 661151567. The next prime is 661151593. The reversal of 661151575 is 575151166.

It is not a de Polignac number, because 661151575 - 2³ = 661151567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158770 + ... + 162880.

Almost surely, 2^661151575 is an apocalyptic number.

661151575 is a deficient number, since it is larger than the sum of its proper divisors (277042345).

661151575 is a wasteful number, since it uses less digits than its factorization.

661151575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5047 (or 5042 counting only the distinct ones).

The product of its digits is 31500, while the sum is 37.

The square root of 661151575 is about 25712.8678874994. The cubic root of 661151575 is about 871.1648531094.

The spelling of 661151575 in words is "six hundred sixty-one million, one hundred fifty-one thousand, five hundred seventy-five".