815361497440 has 72 divisors (see below), whose sum is σ = 2240788136832. Its totient is φ = 279552510720.

The previous prime is 815361497393. The next prime is 815361497491. The reversal of 815361497440 is 44794163518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51992256 + ... + 52007935.

It is an arithmetic number, because the mean of its divisors is an integer number (31122057456).

Almost surely, 2^815361497440 is an apocalyptic number.

815361497440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

815361497440 is an abundant number, since it is smaller than the sum of its proper divisors (1425426639392).

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

815361497440 is a wasteful number, since it uses less digits than its factorization.

815361497440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104000220 (or 104000205 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 815361497440 in words is "eight hundred fifteen billion, three hundred sixty-one million, four hundred ninety-seven thousand, four hundred forty".