215890661016 has 64 divisors (see below), whose sum is σ = 634972543200. Its totient is φ = 67730402304.

The previous prime is 215890660987. The next prime is 215890661053. The reversal of 215890661016 is 610166098512.

215890661016 is a `hidden beast` number, since 2 + 1 + 589 + 0 + 6 + 61 + 0 + 1 + 6 = 666.

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, 29393205 + ... + 29400548.

Almost surely, 2^215890661016 is an apocalyptic number.

It is an amenable number.

215890661016 is an abundant number, since it is smaller than the sum of its proper divisors (419081882184).

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

215890661016 is a wasteful number, since it uses less digits than its factorization.

215890661016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58793785 (or 58793775 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 215890661016 in words is "two hundred fifteen billion, eight hundred ninety million, six hundred sixty-one thousand, sixteen".