661157363 has 8 divisors (see below), whose sum is σ = 672883200. Its totient is φ = 649448968.

The previous prime is 661157347. The next prime is 661157447. The reversal of 661157363 is 363751166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661157363 - 2⁴ = 661157347 is a prime.

It is a super-2 number, since 2×661157363² = 874258117298227538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661157303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89858 + ... + 96936.

It is an arithmetic number, because the mean of its divisors is an integer number (84110400).

Almost surely, 2^661157363 is an apocalyptic number.

661157363 is a deficient number, since it is larger than the sum of its proper divisors (11725837).

661157363 is a wasteful number, since it uses less digits than its factorization.

661157363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8721.

The product of its digits is 68040, while the sum is 38.

The square root of 661157363 is about 25712.9804379033. The cubic root of 661157363 is about 871.1673952836.

The spelling of 661157363 in words is "six hundred sixty-one million, one hundred fifty-seven thousand, three hundred sixty-three".