215555051504 has 80 divisors (see below), whose sum is σ = 476824356288. Its totient is φ = 93516066816.

The previous prime is 215555051497. The next prime is 215555051581. The reversal of 215555051504 is 405150555512.

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, 2779949 + ... + 2856435.

Almost surely, 2^215555051504 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 215555051504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238412178144).

215555051504 is an abundant number, since it is smaller than the sum of its proper divisors (261269304784).

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

215555051504 is a wasteful number, since it uses less digits than its factorization.

215555051504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77322 (or 77316 counting only the distinct ones).

The product of its (nonzero) digits is 125000, while the sum is 38.

The spelling of 215555051504 in words is "two hundred fifteen billion, five hundred fifty-five million, fifty-one thousand, five hundred four".