660602651 has 4 divisors (see below), whose sum is σ = 664655592. Its totient is φ = 656549712.

The previous prime is 660602641. The next prime is 660602669. The reversal of 660602651 is 156206066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156206066 = 2 ⋅78103033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660602651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660602641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026226 + ... + 2026551.

It is an arithmetic number, because the mean of its divisors is an integer number (166163898).

Almost surely, 2^660602651 is an apocalyptic number.

660602651 is a deficient number, since it is larger than the sum of its proper divisors (4052941).

660602651 is a wasteful number, since it uses less digits than its factorization.

660602651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052940.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 660602651 is about 25702.1915602542. The cubic root of 660602651 is about 870.9236902059.

The spelling of 660602651 in words is "six hundred sixty million, six hundred two thousand, six hundred fifty-one".