661523313350 has 24 divisors (see below), whose sum is σ = 1253649091680. Its totient is φ = 259616695520.

The previous prime is 661523313337. The next prime is 661523313371. The reversal of 661523313350 is 53313325166.

It is a super-2 number, since 2×661523313350² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124813070 + ... + 124818369.

It is an arithmetic number, because the mean of its divisors is an integer number (52235378820).

Almost surely, 2^661523313350 is an apocalyptic number.

661523313350 is a deficient number, since it is larger than the sum of its proper divisors (592125778330).

661523313350 is a wasteful number, since it uses less digits than its factorization.

661523313350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249631504 (or 249631499 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 38.

The spelling of 661523313350 in words is "six hundred sixty-one billion, five hundred twenty-three million, three hundred thirteen thousand, three hundred fifty".