71638998455 has 16 divisors (see below), whose sum is σ = 86631117408. Its totient is φ = 56870016000.

The previous prime is 71638998451. The next prime is 71638998479. The reversal of 71638998455 is 55489983617.

It is not a de Polignac number, because 71638998455 - 2² = 71638998451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71638998391 and 71638998400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71638998451) 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, 232820 + ... + 444390.

It is an arithmetic number, because the mean of its divisors is an integer number (5414444838).

Almost surely, 2^71638998455 is an apocalyptic number.

71638998455 is a deficient number, since it is larger than the sum of its proper divisors (14992118953).

71638998455 is a wasteful number, since it uses less digits than its factorization.

71638998455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212098.

The product of its digits is 65318400, while the sum is 65.

The spelling of 71638998455 in words is "seventy-one billion, six hundred thirty-eight million, nine hundred ninety-eight thousand, four hundred fifty-five".