7981045681 has 4 divisors (see below), whose sum is σ = 9121195072. Its totient is φ = 6840896292.

The previous prime is 7981045679. The next prime is 7981045687. The reversal of 7981045681 is 1865401897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7981045681 - 2¹ = 7981045679 is a prime.

It is a super-2 number, since 2×7981045681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981045687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570074685 + ... + 570074698.

It is an arithmetic number, because the mean of its divisors is an integer number (2280298768).

Almost surely, 2^7981045681 is an apocalyptic number.

It is an amenable number.

7981045681 is a deficient number, since it is larger than the sum of its proper divisors (1140149391).

7981045681 is a wasteful number, since it uses less digits than its factorization.

7981045681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140149390.

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 7981045681 is about 89336.6983999297. The cubic root of 7981045681 is about 1998.4192243200.

The spelling of 7981045681 in words is "seven billion, nine hundred eighty-one million, forty-five thousand, six hundred eighty-one".