215858856913 has 8 divisors (see below), whose sum is σ = 251350475328. Its totient is φ = 181530898224.

The previous prime is 215858856881. The next prime is 215858856973. The reversal of 215858856913 is 319658858512.

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 215858856913 - 2⁵ = 215858856881 is a prime.

It is a super-3 number, since 3×215858856913³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215858856973) 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, 290914531 + ... + 290915272.

It is an arithmetic number, because the mean of its divisors is an integer number (31418809416).

Almost surely, 2^215858856913 is an apocalyptic number.

It is an amenable number.

215858856913 is a deficient number, since it is larger than the sum of its proper divisors (35491618415).

215858856913 is an equidigital number, since it uses as much as digits as its factorization.

215858856913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581829863.

The product of its digits is 20736000, while the sum is 61.

The spelling of 215858856913 in words is "two hundred fifteen billion, eight hundred fifty-eight million, eight hundred fifty-six thousand, nine hundred thirteen".