660874928691 has 4 divisors (see below), whose sum is σ = 881166571592. Its totient is φ = 440583285792.

The previous prime is 660874928671. The next prime is 660874928711. The reversal of 660874928691 is 196829478066.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (660874928671) and next prime (660874928711).

It is not a de Polignac number, because 660874928691 - 2²¹ = 660872831539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660874928621) 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, 110145821446 + ... + 110145821451.

It is an arithmetic number, because the mean of its divisors is an integer number (220291642898).

Almost surely, 2^660874928691 is an apocalyptic number.

660874928691 is a deficient number, since it is larger than the sum of its proper divisors (220291642901).

660874928691 is a wasteful number, since it uses less digits than its factorization.

660874928691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220291642900.

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 660874928691 in words is "six hundred sixty billion, eight hundred seventy-four million, nine hundred twenty-eight thousand, six hundred ninety-one".