81753672484 has 24 divisors (see below), whose sum is σ = 156088937088. Its totient is φ = 37157487840.

The previous prime is 81753672449. The next prime is 81753672487. The reversal of 81753672484 is 48427635718.

It is a super-2 number, since 2×81753672484² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81753672487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464517 + ... + 615859.

It is an arithmetic number, because the mean of its divisors is an integer number (6503705712).

Almost surely, 2^81753672484 is an apocalyptic number.

It is an amenable number.

81753672484 is a deficient number, since it is larger than the sum of its proper divisors (74335264604).

81753672484 is a wasteful number, since it uses less digits than its factorization.

81753672484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163635 (or 163633 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 55.

The spelling of 81753672484 in words is "eighty-one billion, seven hundred fifty-three million, six hundred seventy-two thousand, four hundred eighty-four".