215666069493 has 64 divisors (see below), whose sum is σ = 356281920000. Its totient is φ = 115771686912.

The previous prime is 215666069491. The next prime is 215666069503. The reversal of 215666069493 is 394960666512.

It is not a de Polignac number, because 215666069493 - 2¹ = 215666069491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215666069491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1006453 + ... + 1201781.

It is an arithmetic number, because the mean of its divisors is an integer number (5566905000).

Almost surely, 2^215666069493 is an apocalyptic number.

It is an amenable number.

215666069493 is a deficient number, since it is larger than the sum of its proper divisors (140615850507).

215666069493 is a wasteful number, since it uses less digits than its factorization.

215666069493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195419 (or 195405 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 57.

The spelling of 215666069493 in words is "two hundred fifteen billion, six hundred sixty-six million, sixty-nine thousand, four hundred ninety-three".