215161028640 has 72 divisors (see below), whose sum is σ = 734237015148. Its totient is φ = 57376273920.

The previous prime is 215161028639. The next prime is 215161028653. The reversal of 215161028640 is 46820161512.

It is a happy number.

215161028640 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 6 + 1 + 0 + 2 + 8 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 214854498576 + 306530064 = 463524^2 + 17508^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 215161028595 and 215161028604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74707251 + ... + 74710130.

Almost surely, 2^215161028640 is an apocalyptic number.

215161028640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215161028640 is an abundant number, since it is smaller than the sum of its proper divisors (519075986508).

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

215161028640 is a wasteful number, since it uses less digits than its factorization.

215161028640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149417402 (or 149417391 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 215161028640 in words is "two hundred fifteen billion, one hundred sixty-one million, twenty-eight thousand, six hundred forty".