81461040396 has 12 divisors (see below), whose sum is σ = 190075760952. Its totient is φ = 27153680128.

The previous prime is 81461040379. The next prime is 81461040433. The reversal of 81461040396 is 69304016418.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×81461040396² (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 3 ways as a sum of consecutive naturals, for example, 3394210005 + ... + 3394210028.

It is an arithmetic number, because the mean of its divisors is an integer number (15839646746).

Almost surely, 2^81461040396 is an apocalyptic number.

It is an amenable number.

81461040396 is an abundant number, since it is smaller than the sum of its proper divisors (108614720556).

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

81461040396 is a wasteful number, since it uses less digits than its factorization.

81461040396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788420040 (or 6788420038 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 81461040396 in words is "eighty-one billion, four hundred sixty-one million, forty thousand, three hundred ninety-six".