7870517655 has 128 divisors (see below), whose sum is σ = 16975042560. Its totient is φ = 3007272960.

The previous prime is 7870517653. The next prime is 7870517657. The reversal of 7870517655 is 5567150787.

It is an interprime number because it is at equal distance from previous prime (7870517653) and next prime (7870517657).

It is not a de Polignac number, because 7870517655 - 2¹ = 7870517653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7870517598 and 7870517607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7870517653) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4398501 + ... + 4400289.

It is an arithmetic number, because the mean of its divisors is an integer number (132617520).

Almost surely, 2^7870517655 is an apocalyptic number.

7870517655 is an abundant number, since it is smaller than the sum of its proper divisors (9104524905).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7870517655 is a wasteful number, since it uses less digits than its factorization.

7870517655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121.

The product of its (nonzero) digits is 2058000, while the sum is 51.

The square root of 7870517655 is about 88715.9379987610. The cubic root of 7870517655 is about 1989.1510612569.

It can be divided in two parts, 7870 and 517655, that added together give a palindrome (525525).

The spelling of 7870517655 in words is "seven billion, eight hundred seventy million, five hundred seventeen thousand, six hundred fifty-five".