7855128613 has 8 divisors (see below), whose sum is σ = 8678812608. Its totient is φ = 7071624384.

The previous prime is 7855128581. The next prime is 7855128629. The reversal of 7855128613 is 3168215587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7855128613 - 2⁵ = 7855128581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7855128653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10044531 + ... + 10045312.

It is an arithmetic number, because the mean of its divisors is an integer number (1084851576).

Almost surely, 2^7855128613 is an apocalyptic number.

It is an amenable number.

7855128613 is a deficient number, since it is larger than the sum of its proper divisors (823683995).

7855128613 is a wasteful number, since it uses less digits than its factorization.

7855128613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20089883.

The product of its digits is 403200, while the sum is 46.

The square root of 7855128613 is about 88629.1634452227. The cubic root of 7855128613 is about 1987.8537682728.

The spelling of 7855128613 in words is "seven billion, eight hundred fifty-five million, one hundred twenty-eight thousand, six hundred thirteen".