81674666496 has 200 divisors, whose sum is σ = 244221383340. Its totient is φ = 27175329792.

The previous prime is 81674666459. The next prime is 81674666501. The reversal of 81674666496 is 69466647618.

It can be written as a sum of positive squares in 2 ways, for example, as 58594980096 + 23079686400 = 242064^2 + 151920^2 .

It is a super-2 number, since 2×81674666496² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28075090 + ... + 28077998.

Almost surely, 2^81674666496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81674666496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122110691670).

81674666496 is an abundant number, since it is smaller than the sum of its proper divisors (162546716844).

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

81674666496 is an equidigital number, since it uses as much as digits as its factorization.

81674666496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616 (or 3591 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 81674666496 in words is "eighty-one billion, six hundred seventy-four million, six hundred sixty-six thousand, four hundred ninety-six".