215617552636240 has 80 divisors (see below), whose sum is σ = 503140517928000. Its totient is φ = 85932303215616.

The previous prime is 215617552636229. The next prime is 215617552636267. The reversal of 215617552636240 is 42636255716512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×215617552636240² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196397956 + ... + 197492764.

It is an arithmetic number, because the mean of its divisors is an integer number (6289256474100).

Almost surely, 2^{215617552636240} is an apocalyptic number.

215617552636240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215617552636240 is an abundant number, since it is smaller than the sum of its proper divisors (287522965291760).

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

215617552636240 is a wasteful number, since it uses less digits than its factorization.

215617552636240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103804 (or 1103798 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 215617552636240 in words is "two hundred fifteen trillion, six hundred seventeen billion, five hundred fifty-two million, six hundred thirty-six thousand, two hundred forty".