661657148480 has 28 divisors (see below), whose sum is σ = 1575571085580. Its totient is φ = 264662859264.

The previous prime is 661657148479. The next prime is 661657148491. The reversal of 661657148480 is 84841756166.

It can be written as a sum of positive squares in 2 ways, for example, as 169717633024 + 491939515456 = 411968^2 + 701384^2 .

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, 1033838975 + ... + 1033839614.

Almost surely, 2^661657148480 is an apocalyptic number.

It is an amenable number.

661657148480 is an abundant number, since it is smaller than the sum of its proper divisors (913913937100).

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

661657148480 is a wasteful number, since it uses less digits than its factorization.

661657148480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067678606 (or 2067678596 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 661657148480 in words is "six hundred sixty-one billion, six hundred fifty-seven million, one hundred forty-eight thousand, four hundred eighty".