81488358861 has 64 divisors (see below), whose sum is σ = 138624030720. Its totient is φ = 41414204160.

The previous prime is 81488358857. The next prime is 81488358869. The reversal of 81488358861 is 16885388418.

It is not a de Polignac number, because 81488358861 - 2² = 81488358857 is a prime.

It is a super-3 number, since 3×81488358861³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81488358795 and 81488358804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81488358869) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3876766 + ... + 3897728.

It is an arithmetic number, because the mean of its divisors is an integer number (2166000480).

Almost surely, 2^81488358861 is an apocalyptic number.

It is an amenable number.

81488358861 is a deficient number, since it is larger than the sum of its proper divisors (57135671859).

81488358861 is a wasteful number, since it uses less digits than its factorization.

81488358861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21506.

The product of its digits is 11796480, while the sum is 60.

The spelling of 81488358861 in words is "eighty-one billion, four hundred eighty-eight million, three hundred fifty-eight thousand, eight hundred sixty-one".