661455634060 has 48 divisors (see below), whose sum is σ = 1504864984896. Its totient is φ = 242767302912.

The previous prime is 661455633991. The next prime is 661455634069. The reversal of 661455634060 is 60436554166.

It is a happy number.

661455634060 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 661455634060.

It is not an unprimeable number, because it can be changed into a prime (661455634069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7573527 + ... + 7660366.

It is an arithmetic number, because the mean of its divisors is an integer number (31351353852).

Almost surely, 2^661455634060 is an apocalyptic number.

It is an amenable number.

661455634060 is an abundant number, since it is smaller than the sum of its proper divisors (843409350836).

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

661455634060 is a wasteful number, since it uses less digits than its factorization.

661455634060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15234082 (or 15234080 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 661455634060 in words is "six hundred sixty-one billion, four hundred fifty-five million, six hundred thirty-four thousand, sixty".