7875863538865 has 32 divisors (see below), whose sum is σ = 10946915755776. Its totient is φ = 5327912083200.

The previous prime is 7875863538863. The next prime is 7875863538877. The reversal of 7875863538865 is 5688353685787.

It is not a de Polignac number, because 7875863538865 - 2¹ = 7875863538863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7875863538863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102639 + ... + 3970171.

It is an arithmetic number, because the mean of its divisors is an integer number (342091117368).

Almost surely, 2^{7875863538865} is an apocalyptic number.

It is an amenable number.

7875863538865 is a deficient number, since it is larger than the sum of its proper divisors (3071052216911).

7875863538865 is a wasteful number, since it uses less digits than its factorization.

7875863538865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3868329.

The product of its digits is 8128512000, while the sum is 79.

The spelling of 7875863538865 in words is "seven trillion, eight hundred seventy-five billion, eight hundred sixty-three million, five hundred thirty-eight thousand, eight hundred sixty-five".