660778371950 has 24 divisors (see below), whose sum is σ = 1293734498520. Its totient is φ = 250400224800.

The previous prime is 660778371901. The next prime is 660778371961. The reversal of 660778371950 is 59173877066.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 660778371950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347777141 + ... + 347779040.

It is an arithmetic number, because the mean of its divisors is an integer number (53905604105).

Almost surely, 2^660778371950 is an apocalyptic number.

660778371950 is a deficient number, since it is larger than the sum of its proper divisors (632956126570).

660778371950 is a wasteful number, since it uses less digits than its factorization.

660778371950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695556212 (or 695556207 counting only the distinct ones).

The product of its (nonzero) digits is 13335840, while the sum is 59.

The spelling of 660778371950 in words is "six hundred sixty billion, seven hundred seventy-eight million, three hundred seventy-one thousand, nine hundred fifty".