815561740281 has 8 divisors (see below), whose sum is σ = 1087508729440. Its totient is φ = 543661288992.

The previous prime is 815561740271. The next prime is 815561740351. The reversal of 815561740281 is 182047165518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 815561740281 - 2⁵ = 815561740249 is a prime.

It is a super-2 number, since 2×815561740281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815561740281.

It is not an unprimeable number, because it can be changed into a prime (815561740271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11593555 + ... + 11663688.

It is an arithmetic number, because the mean of its divisors is an integer number (135938591180).

Almost surely, 2^815561740281 is an apocalyptic number.

It is an amenable number.

815561740281 is a deficient number, since it is larger than the sum of its proper divisors (271946989159).

815561740281 is a wasteful number, since it uses less digits than its factorization.

815561740281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23268935.

The product of its (nonzero) digits is 537600, while the sum is 48.

The spelling of 815561740281 in words is "eight hundred fifteen billion, five hundred sixty-one million, seven hundred forty thousand, two hundred eighty-one".