7940366881 has 4 divisors (see below), whose sum is σ = 7940816532. Its totient is φ = 7939917232.

The previous prime is 7940366831. The next prime is 7940366887. The reversal of 7940366881 is 1886630497.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2149156881 + 5791210000 = 46359^2 + 76100^2 .

It is a cyclic number.

It is not a de Polignac number, because 7940366881 - 2¹⁹ = 7939842593 is a prime.

It is a super-2 number, since 2×7940366881² (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 (7940366887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197206 + ... + 234031.

It is an arithmetic number, because the mean of its divisors is an integer number (1985204133).

Almost surely, 2^7940366881 is an apocalyptic number.

It is an amenable number.

7940366881 is a deficient number, since it is larger than the sum of its proper divisors (449651).

7940366881 is a wasteful number, since it uses less digits than its factorization.

7940366881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449650.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 7940366881 is about 89108.7362776513. The cubic root of 7940366881 is about 1995.0181744271.

The spelling of 7940366881 in words is "seven billion, nine hundred forty million, three hundred sixty-six thousand, eight hundred eighty-one".