253347979815 has 72 divisors (see below), whose sum is σ = 528447291840. Its totient is φ = 111822528384.

The previous prime is 253347979793. The next prime is 253347979847. The reversal of 253347979815 is 518979743352.

253347979815 is a `hidden beast` number, since 2 + 533 + 4 + 7 + 9 + 7 + 98 + 1 + 5 = 666.

It is not a de Polignac number, because 253347979815 - 2⁹ = 253347979303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1917039 + ... + 2044928.

It is an arithmetic number, because the mean of its divisors is an integer number (7339545720).

Almost surely, 2^253347979815 is an apocalyptic number.

253347979815 is an abundant number, since it is smaller than the sum of its proper divisors (275099312025).

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

253347979815 is a wasteful number, since it uses less digits than its factorization.

253347979815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962021 (or 3962011 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 63.

The spelling of 253347979815 in words is "two hundred fifty-three billion, three hundred forty-seven million, nine hundred seventy-nine thousand, eight hundred fifteen".