216168557628 has 48 divisors (see below), whose sum is σ = 507226487040. Its totient is φ = 71652556800.

The previous prime is 216168557609. The next prime is 216168557639. The reversal of 216168557628 is 826755861612.

It is a congruent number.

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, 1494588 + ... + 1632828.

It is an arithmetic number, because the mean of its divisors is an integer number (10567218480).

Almost surely, 2^216168557628 is an apocalyptic number.

It is an amenable number.

216168557628 is an abundant number, since it is smaller than the sum of its proper divisors (291057929412).

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

216168557628 is a wasteful number, since it uses less digits than its factorization.

216168557628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138978 (or 138976 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 57.

The spelling of 216168557628 in words is "two hundred sixteen billion, one hundred sixty-eight million, five hundred fifty-seven thousand, six hundred twenty-eight".