81347710548 has 48 divisors (see below), whose sum is σ = 216436449600. Its totient is φ = 23557707264.

The previous prime is 81347710519. The next prime is 81347710553. The reversal of 81347710548 is 84501774318.

It is a super-2 number, since 2×81347710548² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81347710497 and 81347710506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15334398 + ... + 15339701.

It is an arithmetic number, because the mean of its divisors is an integer number (4509092700).

Almost surely, 2^81347710548 is an apocalyptic number.

It is an amenable number.

81347710548 is an abundant number, since it is smaller than the sum of its proper divisors (135088739052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81347710548 is a wasteful number, since it uses less digits than its factorization.

81347710548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30674136 (or 30674134 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 81347710548 in words is "eighty-one billion, three hundred forty-seven million, seven hundred ten thousand, five hundred forty-eight".