215846561620 has 12 divisors (see below), whose sum is σ = 453277779444. Its totient is φ = 86338624640.

The previous prime is 215846561617. The next prime is 215846561621. The reversal of 215846561620 is 26165648512.

It can be written as a sum of positive squares in 2 ways, for example, as 70859245636 + 144987315984 = 266194^2 + 380772^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215846561621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5396164021 + ... + 5396164060.

It is an arithmetic number, because the mean of its divisors is an integer number (37773148287).

Almost surely, 2^215846561620 is an apocalyptic number.

215846561620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215846561620 is an abundant number, since it is smaller than the sum of its proper divisors (237431217824).

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

215846561620 is a wasteful number, since it uses less digits than its factorization.

215846561620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10792328090 (or 10792328088 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 215846561620 in words is "two hundred fifteen billion, eight hundred forty-six million, five hundred sixty-one thousand, six hundred twenty".