661975762 has 16 divisors (see below), whose sum is σ = 1135150272. Its totient is φ = 283620240.

The previous prime is 661975757. The next prime is 661975807. The reversal of 661975762 is 267579166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77433 + ... + 85555.

It is an arithmetic number, because the mean of its divisors is an integer number (70946892).

Almost surely, 2^661975762 is an apocalyptic number.

661975762 is a deficient number, since it is larger than the sum of its proper divisors (473174510).

661975762 is a wasteful number, since it uses less digits than its factorization.

661975762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13953.

The product of its digits is 952560, while the sum is 49.

The square root of 661975762 is about 25728.8896379148. The cubic root of 661975762 is about 871.5266988282.

The spelling of 661975762 in words is "six hundred sixty-one million, nine hundred seventy-five thousand, seven hundred sixty-two".