861137598553 has 4 divisors (see below), whose sum is σ = 861142387428. Its totient is φ = 861132809680.

The previous prime is 861137598551. The next prime is 861137598599. The reversal of 861137598553 is 355895731168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175831778329 + 685305820224 = 419323^2 + 827832^2 .

It is a cyclic number.

It is not a de Polignac number, because 861137598553 - 2¹ = 861137598551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861137598491 and 861137598500.

It is not an unprimeable number, because it can be changed into a prime (861137598551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2113738 + ... + 2488003.

It is an arithmetic number, because the mean of its divisors is an integer number (215285596857).

Almost surely, 2^861137598553 is an apocalyptic number.

It is an amenable number.

861137598553 is a deficient number, since it is larger than the sum of its proper divisors (4788875).

861137598553 is a wasteful number, since it uses less digits than its factorization.

861137598553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4788874.

The product of its digits is 27216000, while the sum is 61.

The spelling of 861137598553 in words is "eight hundred sixty-one billion, one hundred thirty-seven million, five hundred ninety-eight thousand, five hundred fifty-three".