815885052145 has 16 divisors (see below), whose sum is σ = 987974499600. Its totient is φ = 646787232000.

The previous prime is 815885052133. The next prime is 815885052149. The reversal of 815885052145 is 541250588518.

It can be written as a sum of positive squares in 8 ways, for example, as 383189474529 + 432695577616 = 619023^2 + 657796^2 .

It is not a de Polignac number, because 815885052145 - 2²¹ = 815882954993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 815885052092 and 815885052101.

It is not an unprimeable number, because it can be changed into a prime (815885052149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987006 + ... + 1614295.

It is an arithmetic number, because the mean of its divisors is an integer number (61748406225).

Almost surely, 2^815885052145 is an apocalyptic number.

It is an amenable number.

815885052145 is a deficient number, since it is larger than the sum of its proper divisors (172089447455).

815885052145 is a wasteful number, since it uses less digits than its factorization.

815885052145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601876.

The product of its (nonzero) digits is 2560000, while the sum is 52.

The spelling of 815885052145 in words is "eight hundred fifteen billion, eight hundred eighty-five million, fifty-two thousand, one hundred forty-five".