7940640899 has 2 divisors, whose sum is σ = 7940640900. Its totient is φ = 7940640898.

The previous prime is 7940640893. The next prime is 7940640937. The reversal of 7940640899 is 9980460497.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7940640899 is a prime.

It is not a weakly prime, because it can be changed into another prime (7940640893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3970320449 + 3970320450.

It is an arithmetic number, because the mean of its divisors is an integer number (3970320450).

Almost surely, 2^7940640899 is an apocalyptic number.

7940640899 is a deficient number, since it is larger than the sum of its proper divisors (1).

7940640899 is an equidigital number, since it uses as much as digits as its factorization.

7940640899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 7940640899 is about 89110.2738128438. The cubic root of 7940640899 is about 1995.0411231821.

The spelling of 7940640899 in words is "seven billion, nine hundred forty million, six hundred forty thousand, eight hundred ninety-nine".