215270661940 has 12 divisors (see below), whose sum is σ = 452068390116. Its totient is φ = 86108264768.

The previous prime is 215270661923. The next prime is 215270661961. The reversal of 215270661940 is 49166072512.

215270661940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 169997886864 + 45272775076 = 412308^2 + 212774^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5381766529 + ... + 5381766568.

It is an arithmetic number, because the mean of its divisors is an integer number (37672365843).

Almost surely, 2^215270661940 is an apocalyptic number.

215270661940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215270661940 is an abundant number, since it is smaller than the sum of its proper divisors (236797728176).

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

215270661940 is a wasteful number, since it uses less digits than its factorization.

215270661940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10763533106 (or 10763533104 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 215270661940 in words is "two hundred fifteen billion, two hundred seventy million, six hundred sixty-one thousand, nine hundred forty".