660952681 has 9 divisors (see below), whose sum is σ = 676551549. Its totient is φ = 645707244.

The previous prime is 660952657. The next prime is 660952709. The reversal of 660952681 is 186259066.

The square root of 660952681 is 25709.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 660952681 - 2⁷ = 660952553 is a prime.

It is a super-2 number, since 2×660952681² = 873716893042175522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660959681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1208050 + ... + 1208596.

Almost surely, 2^660952681 is an apocalyptic number.

660952681 is the 25709-th square number.

660952681 is the 12855-th centered octagonal number.

It is an amenable number.

660952681 is a deficient number, since it is larger than the sum of its proper divisors (15598868).

660952681 is an frugal number, since it uses more digits than its factorization.

660952681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The cubic root of 660952681 is about 871.0774869407.

The spelling of 660952681 in words is "six hundred sixty million, nine hundred fifty-two thousand, six hundred eighty-one".