861663714519 has 16 divisors (see below), whose sum is σ = 1177080678144. Its totient is φ = 560348760000.

The previous prime is 861663714451. The next prime is 861663714521. The reversal of 861663714519 is 915417366168.

It is not a de Polignac number, because 861663714519 - 2⁷ = 861663714391 is a prime.

It is a super-2 number, since 2×861663714519² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861663714529) 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, 321894 + ... + 1351644.

It is an arithmetic number, because the mean of its divisors is an integer number (73567542384).

Almost surely, 2^861663714519 is an apocalyptic number.

861663714519 is a deficient number, since it is larger than the sum of its proper divisors (315416963625).

861663714519 is a wasteful number, since it uses less digits than its factorization.

861663714519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036598.

The product of its digits is 6531840, while the sum is 57.

The spelling of 861663714519 in words is "eight hundred sixty-one billion, six hundred sixty-three million, seven hundred fourteen thousand, five hundred nineteen".