660963967 has 4 divisors (see below), whose sum is σ = 678827896. Its totient is φ = 643100040.

The previous prime is 660963937. The next prime is 660963983. The reversal of 660963967 is 769369066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769369066 = 2 ⋅384684533.

It is a cyclic number.

It is not a de Polignac number, because 660963967 - 2⁷ = 660963839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660963937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8931909 + ... + 8931982.

It is an arithmetic number, because the mean of its divisors is an integer number (169706974).

Almost surely, 2^660963967 is an apocalyptic number.

660963967 is a deficient number, since it is larger than the sum of its proper divisors (17863929).

660963967 is a wasteful number, since it uses less digits than its factorization.

660963967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17863928.

The product of its (nonzero) digits is 2204496, while the sum is 52.

The square root of 660963967 is about 25709.2194941815. The cubic root of 660963967 is about 871.0824448975.

The spelling of 660963967 in words is "six hundred sixty million, nine hundred sixty-three thousand, nine hundred sixty-seven".