661614513456 has 40 divisors (see below), whose sum is σ = 1840645507120. Its totient is φ = 203573696256.

The previous prime is 661614513451. The next prime is 661614513457. The reversal of 661614513456 is 654315416166.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (661614513451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530139211 + ... + 530140458.

It is an arithmetic number, because the mean of its divisors is an integer number (46016137678).

Almost surely, 2^661614513456 is an apocalyptic number.

It is an amenable number.

661614513456 is an abundant number, since it is smaller than the sum of its proper divisors (1179030993664).

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

661614513456 is a wasteful number, since it uses less digits than its factorization.

661614513456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060279693 (or 1060279687 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The spelling of 661614513456 in words is "six hundred sixty-one billion, six hundred fourteen million, five hundred thirteen thousand, four hundred fifty-six".