215145525249 has 64 divisors (see below), whose sum is σ = 333105177600. Its totient is φ = 137128882176.

The previous prime is 215145525239. The next prime is 215145525277. The reversal of 215145525249 is 942525541512.

215145525249 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 4 + 552 + 52 + 49 = 666.

It is not a de Polignac number, because 215145525249 - 2¹² = 215145521153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215145525239) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15664017 + ... + 15677745.

It is an arithmetic number, because the mean of its divisors is an integer number (5204768400).

Almost surely, 2^215145525249 is an apocalyptic number.

It is an amenable number.

215145525249 is a deficient number, since it is larger than the sum of its proper divisors (117959652351).

215145525249 is a wasteful number, since it uses less digits than its factorization.

215145525249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14071 (or 14065 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The spelling of 215145525249 in words is "two hundred fifteen billion, one hundred forty-five million, five hundred twenty-five thousand, two hundred forty-nine".