215125355620 has 36 divisors (see below), whose sum is σ = 525520513980. Its totient is φ = 73757264448.

The previous prime is 215125355573. The next prime is 215125355633. The reversal of 215125355620 is 26553521512.

It can be written as a sum of positive squares in 2 ways, for example, as 119258334244 + 95867021376 = 345338^2 + 309624^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215125355620.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 109756855 + ... + 109758814.

It is an arithmetic number, because the mean of its divisors is an integer number (14597792055).

Almost surely, 2^215125355620 is an apocalyptic number.

215125355620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215125355620 is an abundant number, since it is smaller than the sum of its proper divisors (310395158360).

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

215125355620 is a wasteful number, since it uses less digits than its factorization.

215125355620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219515692 (or 219515683 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 215125355620 in words is "two hundred fifteen billion, one hundred twenty-five million, three hundred fifty-five thousand, six hundred twenty".