864870240255 has 64 divisors (see below), whose sum is σ = 1677720895488. Its totient is φ = 371397611520.

The previous prime is 864870240197. The next prime is 864870240271. The reversal of 864870240255 is 552042078468.

It is a Cunningham number, because it is equal to 929984²-1.

It is not a de Polignac number, because 864870240255 - 2⁷ = 864870240127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 864870240198 and 864870240207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 464994 + ... + 1394976.

It is an arithmetic number, because the mean of its divisors is an integer number (26214388992).

Almost surely, 2^864870240255 is an apocalyptic number.

864870240255 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

864870240255 is a deficient number, since it is larger than the sum of its proper divisors (812850655233).

864870240255 is a wasteful number, since it uses less digits than its factorization.

864870240255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930536.

The product of its (nonzero) digits is 4300800, while the sum is 51.

The spelling of 864870240255 in words is "eight hundred sixty-four billion, eight hundred seventy million, two hundred forty thousand, two hundred fifty-five".