215719623856 has 80 divisors (see below), whose sum is σ = 460913499648. Its totient is φ = 96988723200.

The previous prime is 215719623853. The next prime is 215719623907. The reversal of 215719623856 is 658326917512.

It is a super-2 number, since 2×215719623856² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215719623797 and 215719623806.

It is not an unprimeable number, because it can be changed into a prime (215719623853) 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, 55840581 + ... + 55844443.

Almost surely, 2^215719623856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215719623856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230456749824).

215719623856 is an abundant number, since it is smaller than the sum of its proper divisors (245193875792).

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

215719623856 is a wasteful number, since it uses less digits than its factorization.

215719623856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7250 (or 7244 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The spelling of 215719623856 in words is "two hundred fifteen billion, seven hundred nineteen million, six hundred twenty-three thousand, eight hundred fifty-six".