215135566650 has 72 divisors (see below), whose sum is σ = 599404906464. Its totient is φ = 57369481200.

The previous prime is 215135566643. The next prime is 215135566717. The reversal of 215135566650 is 56665531512.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 215135566596 and 215135566605.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8841166 + ... + 8865465.

Almost surely, 2^215135566650 is an apocalyptic number.

215135566650 is an abundant number, since it is smaller than the sum of its proper divisors (384269339814).

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

215135566650 is a wasteful number, since it uses less digits than its factorization.

215135566650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17706658 (or 17706641 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 215135566650 in words is "two hundred fifteen billion, one hundred thirty-five million, five hundred sixty-six thousand, six hundred fifty".