661305134060 has 48 divisors (see below), whose sum is σ = 1390872252000. Its totient is φ = 264116381184.

The previous prime is 661305133969. The next prime is 661305134071. The reversal of 661305134060 is 60431503166.

It is a super-2 number, since 2×661305134060² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661305134060.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38219291 + ... + 38236589.

It is an arithmetic number, because the mean of its divisors is an integer number (28976505250).

Almost surely, 2^661305134060 is an apocalyptic number.

It is an amenable number.

661305134060 is an abundant number, since it is smaller than the sum of its proper divisors (729567117940).

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

661305134060 is a wasteful number, since it uses less digits than its factorization.

661305134060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130 (or 20128 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 661305134060 in words is "six hundred sixty-one billion, three hundred five million, one hundred thirty-four thousand, sixty".