81475246160 has 160 divisors (see below), whose sum is σ = 242556118272. Its totient is φ = 24708464640.

The previous prime is 81475246147. The next prime is 81475246211. The reversal of 81475246160 is 6164257418.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49184 + ... + 406656.

Almost surely, 2^81475246160 is an apocalyptic number.

81475246160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81475246160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121278059136).

81475246160 is an abundant number, since it is smaller than the sum of its proper divisors (161080872112).

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

81475246160 is a wasteful number, since it uses less digits than its factorization.

81475246160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357541 (or 357535 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 81475246160 in words is "eighty-one billion, four hundred seventy-five million, two hundred forty-six thousand, one hundred sixty".