661153934142 has 48 divisors (see below), whose sum is σ = 1582300290480. Its totient is φ = 203425350912.

The previous prime is 661153934117. The next prime is 661153934179. The reversal of 661153934142 is 241439351166.

661153934142 is a `hidden beast` number, since 6 + 6 + 115 + 393 + 4 + 142 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21528334 + ... + 21559022.

It is an arithmetic number, because the mean of its divisors is an integer number (32964589385).

Almost surely, 2^661153934142 is an apocalyptic number.

661153934142 is an abundant number, since it is smaller than the sum of its proper divisors (921146356338).

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

661153934142 is an frugal number, since it uses more digits than its factorization.

661153934142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61402 (or 30707 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 661153934142 in words is "six hundred sixty-one billion, one hundred fifty-three million, nine hundred thirty-four thousand, one hundred forty-two".