215901355980 has 24 divisors (see below), whose sum is σ = 604523796912. Its totient is φ = 57573694912.

The previous prime is 215901355927. The next prime is 215901356057. The reversal of 215901355980 is 89553109512.

It is a super-4 number, since 4×215901355980⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799177907 + ... + 1799178026.

It is an arithmetic number, because the mean of its divisors is an integer number (25188491538).

Almost surely, 2^215901355980 is an apocalyptic number.

215901355980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215901355980 is an abundant number, since it is smaller than the sum of its proper divisors (388622440932).

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

215901355980 is a wasteful number, since it uses less digits than its factorization.

215901355980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598355945 (or 3598355943 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 48.

The spelling of 215901355980 in words is "two hundred fifteen billion, nine hundred one million, three hundred fifty-five thousand, nine hundred eighty".