660778371948 has 48 divisors (see below), whose sum is σ = 1551371673600. Its totient is φ = 218896598400.

The previous prime is 660778371901. The next prime is 660778371961. The reversal of 660778371948 is 849173877066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2266893 + ... + 2541723.

It is an arithmetic number, because the mean of its divisors is an integer number (32320243200).

Almost surely, 2^660778371948 is an apocalyptic number.

It is an amenable number.

660778371948 is an abundant number, since it is smaller than the sum of its proper divisors (890593301652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660778371948 is a wasteful number, since it uses less digits than its factorization.

660778371948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276078 (or 276076 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 66.

The spelling of 660778371948 in words is "six hundred sixty billion, seven hundred seventy-eight million, three hundred seventy-one thousand, nine hundred forty-eight".