661459437860 has 48 divisors (see below), whose sum is σ = 1502624234496. Its totient is φ = 243135948672.

The previous prime is 661459437829. The next prime is 661459437949. The reversal of 661459437860 is 68734954166.

It is a self number, because there is not a number n which added to its sum of digits gives 661459437860.

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, 5646224 + ... + 5762183.

It is an arithmetic number, because the mean of its divisors is an integer number (31304671552).

Almost surely, 2^661459437860 is an apocalyptic number.

It is an amenable number.

661459437860 is an abundant number, since it is smaller than the sum of its proper divisors (841164796636).

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

661459437860 is a wasteful number, since it uses less digits than its factorization.

661459437860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408652 (or 11408650 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 661459437860 in words is "six hundred sixty-one billion, four hundred fifty-nine million, four hundred thirty-seven thousand, eight hundred sixty".