215726963397 has 16 divisors (see below), whose sum is σ = 313792647168. Its totient is φ = 130740292080.

The previous prime is 215726963383. The next prime is 215726963401. The reversal of 215726963397 is 793369627512.

It is a de Polignac number, because none of the positive numbers 2^k-215726963397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215726963397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215726963317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2063058 + ... + 2165100.

It is an arithmetic number, because the mean of its divisors is an integer number (19612040448).

Almost surely, 2^215726963397 is an apocalyptic number.

It is an amenable number.

215726963397 is a deficient number, since it is larger than the sum of its proper divisors (98065683771).

215726963397 is a wasteful number, since it uses less digits than its factorization.

215726963397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166120.

The product of its digits is 25719120, while the sum is 60.

The spelling of 215726963397 in words is "two hundred fifteen billion, seven hundred twenty-six million, nine hundred sixty-three thousand, three hundred ninety-seven".