661501376 has 14 divisors (see below), whose sum is σ = 1312666920. Its totient is φ = 330750656.

The previous prime is 661501369. The next prime is 661501387. The reversal of 661501376 is 673105166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5167916 + ... + 5168043.

Almost surely, 2^661501376 is an apocalyptic number.

It is an amenable number.

661501376 is a deficient number, since it is larger than the sum of its proper divisors (651165544).

661501376 is a wasteful number, since it uses less digits than its factorization.

661501376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10335971 (or 10335961 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 661501376 is about 25719.6690491927. The cubic root of 661501376 is about 871.3184641830.

The spelling of 661501376 in words is "six hundred sixty-one million, five hundred one thousand, three hundred seventy-six".