661393770592 has 24 divisors (see below), whose sum is σ = 1302146852832. Its totient is φ = 330689808000.

The previous prime is 661393770533. The next prime is 661393770593. The reversal of 661393770592 is 295077393166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661393770593) 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, 1504617 + ... + 1893847.

It is an arithmetic number, because the mean of its divisors is an integer number (54256118868).

Almost surely, 2^661393770592 is an apocalyptic number.

It is an amenable number.

661393770592 is a deficient number, since it is larger than the sum of its proper divisors (640753082240).

661393770592 is a wasteful number, since it uses less digits than its factorization.

661393770592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442342 (or 442334 counting only the distinct ones).

The product of its (nonzero) digits is 12859560, while the sum is 58.

The spelling of 661393770592 in words is "six hundred sixty-one billion, three hundred ninety-three million, seven hundred seventy thousand, five hundred ninety-two".