815142939040 has 24 divisors (see below), whose sum is σ = 1925775193860. Its totient is φ = 326057175552.

The previous prime is 815142939019. The next prime is 815142939043. The reversal of 815142939040 is 40939241518.

It can be written as a sum of positive squares in 2 ways, for example, as 786009911184 + 29133027856 = 886572^2 + 170684^2 .

It is a super-2 number, since 2×815142939040² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815142939043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2547321525 + ... + 2547321844.

Almost surely, 2^815142939040 is an apocalyptic number.

815142939040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

815142939040 is an abundant number, since it is smaller than the sum of its proper divisors (1110632254820).

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

815142939040 is a wasteful number, since it uses less digits than its factorization.

815142939040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094643384 (or 5094643376 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 815142939040 in words is "eight hundred fifteen billion, one hundred forty-two million, nine hundred thirty-nine thousand, forty".