666980501 has 8 divisors (see below), whose sum is σ = 728227584. Its totient is φ = 605835520.

The previous prime is 666980491. The next prime is 666980513. The reversal of 666980501 is 105089666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666980501 is a prime.

It is a super-2 number, since 2×666980501² = 889725977428422002, 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 (666980521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11525 + ... + 38298.

It is an arithmetic number, because the mean of its divisors is an integer number (91028448).

Almost surely, 2^666980501 is an apocalyptic number.

It is an amenable number.

666980501 is a deficient number, since it is larger than the sum of its proper divisors (61247083).

666980501 is a wasteful number, since it uses less digits than its factorization.

666980501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51051.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 666980501 is about 25825.9656353833. The cubic root of 666980501 is about 873.7175230031.

The spelling of 666980501 in words is "six hundred sixty-six million, nine hundred eighty thousand, five hundred one".