853996861644 has 24 divisors (see below), whose sum is σ = 1992692932608. Its totient is φ = 284660822160.

The previous prime is 853996861643. The next prime is 853996861681. The reversal of 853996861644 is 446168699358.

It is not an unprimeable number, because it can be changed into a prime (853996861643) 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, 182589 + ... + 1319595.

It is an arithmetic number, because the mean of its divisors is an integer number (83028872192).

Almost surely, 2^853996861644 is an apocalyptic number.

It is an amenable number.

853996861644 is an abundant number, since it is smaller than the sum of its proper divisors (1138696070964).

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

853996861644 is a wasteful number, since it uses less digits than its factorization.

853996861644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199605 (or 1199603 counting only the distinct ones).

The product of its digits is 268738560, while the sum is 69.

The spelling of 853996861644 in words is "eight hundred fifty-three billion, nine hundred ninety-six million, eight hundred sixty-one thousand, six hundred forty-four".