7965640123 has 16 divisors (see below), whose sum is σ = 9891850240. Its totient is φ = 6259680000.

The previous prime is 7965640099. The next prime is 7965640153. The reversal of 7965640123 is 3210465697.

It is not a de Polignac number, because 7965640123 - 2¹³ = 7965631931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7965640123.

It is not an unprimeable number, because it can be changed into a prime (7965640153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961878 + ... + 970123.

It is an arithmetic number, because the mean of its divisors is an integer number (618240640).

Almost surely, 2^7965640123 is an apocalyptic number.

7965640123 is a deficient number, since it is larger than the sum of its proper divisors (1926210117).

7965640123 is a wasteful number, since it uses less digits than its factorization.

7965640123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932058.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 7965640123 is about 89250.4348616857. The cubic root of 7965640123 is about 1997.1325677977.

The spelling of 7965640123 in words is "seven billion, nine hundred sixty-five million, six hundred forty thousand, one hundred twenty-three".