659637978450 has 48 divisors (see below), whose sum is σ = 1784620571616. Its totient is φ = 159912236800.

The previous prime is 659637978407. The next prime is 659637978469. The reversal of 659637978450 is 54879736956.

659637978450 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×659637978450² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199888647 + ... + 199891946.

It is an arithmetic number, because the mean of its divisors is an integer number (37179595242).

Almost surely, 2^659637978450 is an apocalyptic number.

659637978450 is an abundant number, since it is smaller than the sum of its proper divisors (1124982593166).

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

659637978450 is a wasteful number, since it uses less digits than its factorization.

659637978450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399780619 (or 399780614 counting only the distinct ones).

The product of its (nonzero) digits is 342921600, while the sum is 69.

The spelling of 659637978450 in words is "six hundred fifty-nine billion, six hundred thirty-seven million, nine hundred seventy-eight thousand, four hundred fifty".