661372373 has 8 divisors (see below), whose sum is σ = 685845888. Its totient is φ = 637246224.

The previous prime is 661372367. The next prime is 661372399. The reversal of 661372373 is 373273166.

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 661372373 - 2⁴ = 661372357 is a prime.

It is a super-2 number, since 2×661372373² = 874826831535302258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661372363) 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, 82961 + ... + 90582.

It is an arithmetic number, because the mean of its divisors is an integer number (85730736).

Almost surely, 2^661372373 is an apocalyptic number.

It is an amenable number.

661372373 is a deficient number, since it is larger than the sum of its proper divisors (24473515).

661372373 is a wasteful number, since it uses less digits than its factorization.

661372373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173683.

The product of its digits is 95256, while the sum is 38.

The square root of 661372373 is about 25717.1610602726. The cubic root of 661372373 is about 871.2618203082.

The spelling of 661372373 in words is "six hundred sixty-one million, three hundred seventy-two thousand, three hundred seventy-three".