661483454004656 has 20 divisors (see below), whose sum is σ = 1349078096983800. Its totient is φ = 313334267686272.

The previous prime is 661483454004647. The next prime is 661483454004683. The reversal of 661483454004656 is 656400454384166.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087966206941 + ... + 1087966207548.

It is an arithmetic number, because the mean of its divisors is an integer number (67453904849190).

Almost surely, 2^{661483454004656} is an apocalyptic number.

It is an amenable number.

661483454004656 is an abundant number, since it is smaller than the sum of its proper divisors (687594642979144).

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

661483454004656 is a wasteful number, since it uses less digits than its factorization.

661483454004656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175932414516 (or 2175932414510 counting only the distinct ones).

The product of its (nonzero) digits is 199065600, while the sum is 62.

The spelling of 661483454004656 in words is "six hundred sixty-one trillion, four hundred eighty-three billion, four hundred fifty-four million, four thousand, six hundred fifty-six".