660771951 has 16 divisors (see below), whose sum is σ = 1007376384. Its totient is φ = 377401824.

The previous prime is 660771901. The next prime is 660771953. The reversal of 660771951 is 159177066.

It is not a de Polignac number, because 660771951 - 2⁶ = 660771887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660771953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45666 + ... + 58368.

It is an arithmetic number, because the mean of its divisors is an integer number (62961024).

Almost surely, 2^660771951 is an apocalyptic number.

660771951 is a deficient number, since it is larger than the sum of its proper divisors (346604433).

660771951 is a wasteful number, since it uses less digits than its factorization.

660771951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15190.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 660771951 is about 25705.4848427335. The cubic root of 660771951 is about 870.9980842895.

The spelling of 660771951 in words is "six hundred sixty million, seven hundred seventy-one thousand, nine hundred fifty-one".