201597978628 has 24 divisors (see below), whose sum is σ = 358926624000. Its totient is φ = 99048948768.

The previous prime is 201597978623. The next prime is 201597978641. The reversal of 201597978628 is 826879795102.

It is a self number, because there is not a number n which added to its sum of digits gives 201597978628.

It is not an unprimeable number, because it can be changed into a prime (201597978623) 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, 388126 + ... + 744202.

It is an arithmetic number, because the mean of its divisors is an integer number (14955276000).

Almost surely, 2^201597978628 is an apocalyptic number.

It is an amenable number.

201597978628 is a deficient number, since it is larger than the sum of its proper divisors (157328645372).

201597978628 is a wasteful number, since it uses less digits than its factorization.

201597978628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358539 (or 358537 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 64.

The spelling of 201597978628 in words is "two hundred one billion, five hundred ninety-seven million, nine hundred seventy-eight thousand, six hundred twenty-eight".