215722821312768 has 288 divisors, whose sum is σ = 753481628605440. Its totient is φ = 53082853908480.

The previous prime is 215722821312751. The next prime is 215722821312773. The reversal of 215722821312768 is 867213128227512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94874055 + ... + 97121222.

It is an arithmetic number, because the mean of its divisors is an integer number (2616255654880).

Almost surely, 2^{215722821312768} is an apocalyptic number.

215722821312768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

215722821312768 is an abundant number, since it is smaller than the sum of its proper divisors (537758807292672).

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

215722821312768 is a wasteful number, since it uses less digits than its factorization.

215722821312768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191995333 (or 191995319 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 57.

The spelling of 215722821312768 in words is "two hundred fifteen trillion, seven hundred twenty-two billion, eight hundred twenty-one million, three hundred twelve thousand, seven hundred sixty-eight".