861817269951 has 12 divisors (see below), whose sum is σ = 1358015092200. Its totient is φ = 522313496880.

The previous prime is 861817269949. The next prime is 861817269967. The reversal of 861817269951 is 159962718168.

861817269951 is a `hidden beast` number, since 8 + 618 + 1 + 7 + 2 + 6 + 9 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 861817269951 - 2¹ = 861817269949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861817269991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4352612376 + ... + 4352612573.

It is an arithmetic number, because the mean of its divisors is an integer number (113167924350).

Almost surely, 2^861817269951 is an apocalyptic number.

861817269951 is a deficient number, since it is larger than the sum of its proper divisors (496197822249).

861817269951 is a wasteful number, since it uses less digits than its factorization.

861817269951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8705224966 (or 8705224963 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 861817269951 in words is "eight hundred sixty-one billion, eight hundred seventeen million, two hundred sixty-nine thousand, nine hundred fifty-one".