661173295 has 12 divisors (see below), whose sum is σ = 829407096. Its totient is φ = 505939280.

The previous prime is 661173287. The next prime is 661173311. The reversal of 661173295 is 592371166.

It is not a de Polignac number, because 661173295 - 2³ = 661173287 is a prime.

It is a Duffinian number.

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, 122341 + ... + 127630.

It is an arithmetic number, because the mean of its divisors is an integer number (69117258).

Almost surely, 2^661173295 is an apocalyptic number.

661173295 is a deficient number, since it is larger than the sum of its proper divisors (168233801).

661173295 is a wasteful number, since it uses less digits than its factorization.

661173295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250022 (or 249999 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 661173295 is about 25713.2902406518. The cubic root of 661173295 is about 871.1743927742.

The spelling of 661173295 in words is "six hundred sixty-one million, one hundred seventy-three thousand, two hundred ninety-five".