215948997660 has 72 divisors (see below), whose sum is σ = 664623218448. Its totient is φ = 52351270400.

The previous prime is 215948997647. The next prime is 215948997673. The reversal of 215948997660 is 66799849512.

215948997660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215948997647) and next prime (215948997673).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 215948997591 and 215948997600.

It is a congruent number.

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, 14865261 + ... + 14879780.

It is an arithmetic number, because the mean of its divisors is an integer number (9230878034).

Almost surely, 2^215948997660 is an apocalyptic number.

215948997660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215948997660 is an abundant number, since it is smaller than the sum of its proper divisors (448674220788).

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

215948997660 is a wasteful number, since it uses less digits than its factorization.

215948997660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29745075 (or 29745062 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 66.

The spelling of 215948997660 in words is "two hundred fifteen billion, nine hundred forty-eight million, nine hundred ninety-seven thousand, six hundred sixty".