660961965 has 16 divisors (see below), whose sum is σ = 1062286848. Its totient is φ = 350930496.

The previous prime is 660961963. The next prime is 660961967. The reversal of 660961965 is 569169066.

It is an interprime number because it is at equal distance from previous prime (660961963) and next prime (660961967).

It is not a de Polignac number, because 660961965 - 2¹ = 660961963 is a prime.

It is a super-2 number, since 2×660961965² = 873741438353322450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660961963) 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, 95454 + ... + 102143.

It is an arithmetic number, because the mean of its divisors is an integer number (66392928).

Almost surely, 2^660961965 is an apocalyptic number.

It is an amenable number.

660961965 is a deficient number, since it is larger than the sum of its proper divisors (401324883).

660961965 is a wasteful number, since it uses less digits than its factorization.

660961965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197828.

The product of its (nonzero) digits is 524880, while the sum is 48.

The square root of 660961965 is about 25709.1805587031. The cubic root of 660961965 is about 871.0815654200.

The spelling of 660961965 in words is "six hundred sixty million, nine hundred sixty-one thousand, nine hundred sixty-five".