661094331 has 8 divisors (see below), whose sum is σ = 881577984. Its totient is φ = 440670120.

The previous prime is 661094327. The next prime is 661094333. The reversal of 661094331 is 133490166.

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

It is not a de Polignac number, because 661094331 - 2² = 661094327 is a prime.

It is a super-2 number, since 2×661094331² = 874091428960675122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661094292 and 661094301.

It is not an unprimeable number, because it can be changed into a prime (661094333) 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, 34866 + ... + 50376.

It is an arithmetic number, because the mean of its divisors is an integer number (110197248).

Almost surely, 2^661094331 is an apocalyptic number.

661094331 is a deficient number, since it is larger than the sum of its proper divisors (220483653).

661094331 is a wasteful number, since it uses less digits than its factorization.

661094331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29721.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 661094331 is about 25711.7547242502. The cubic root of 661094331 is about 871.1397099087.

The spelling of 661094331 in words is "six hundred sixty-one million, ninety-four thousand, three hundred thirty-one".