84177020631 has 16 divisors (see below), whose sum is σ = 122875043328. Its totient is φ = 50834817600.

The previous prime is 84177020623. The next prime is 84177020659. The reversal of 84177020631 is 13602077148.

It is not a de Polignac number, because 84177020631 - 2³ = 84177020623 is a prime.

It is a super-2 number, since 2×84177020631² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84177020631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84177020611) 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, 4529551 + ... + 4548096.

It is an arithmetic number, because the mean of its divisors is an integer number (7679690208).

Almost surely, 2^84177020631 is an apocalyptic number.

84177020631 is a deficient number, since it is larger than the sum of its proper divisors (38698022697).

84177020631 is a wasteful number, since it uses less digits than its factorization.

84177020631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9077942.

The product of its (nonzero) digits is 56448, while the sum is 39.

Adding to 84177020631 its reverse (13602077148), we get a palindrome (97779097779).

The spelling of 84177020631 in words is "eighty-four billion, one hundred seventy-seven million, twenty thousand, six hundred thirty-one".