215693747664 has 20 divisors (see below), whose sum is σ = 557208848256. Its totient is φ = 71897915872.

The previous prime is 215693747663. The next prime is 215693747683. The reversal of 215693747664 is 466747396512.

It is a junction number, because it is equal to n+sod(n) for n = 215693747598 and 215693747607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215693747663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246809824 + ... + 2246809919.

Almost surely, 2^215693747664 is an apocalyptic number.

215693747664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215693747664 is an abundant number, since it is smaller than the sum of its proper divisors (341515100592).

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

215693747664 is a wasteful number, since it uses less digits than its factorization.

215693747664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493619754 (or 4493619748 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 60.

The spelling of 215693747664 in words is "two hundred fifteen billion, six hundred ninety-three million, seven hundred forty-seven thousand, six hundred sixty-four".