2156615412605 has 8 divisors (see below), whose sum is σ = 2623389707832. Its totient is φ = 1701658188288.

The previous prime is 2156615412583. The next prime is 2156615412613. The reversal of 2156615412605 is 5062145166512.

It can be written as a sum of positive squares in 4 ways, for example, as 834451191289 + 1322164221316 = 913483^2 + 1149854^2 .

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 2156615412605 - 2⁸ = 2156615412349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2954267324 + ... + 2954268053.

It is an arithmetic number, because the mean of its divisors is an integer number (327923713479).

Almost surely, 2^{2156615412605} is an apocalyptic number.

It is an amenable number.

2156615412605 is a deficient number, since it is larger than the sum of its proper divisors (466774295227).

2156615412605 is an equidigital number, since it uses as much as digits as its factorization.

2156615412605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908535455.

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 2156615412605 in words is "two trillion, one hundred fifty-six billion, six hundred fifteen million, four hundred twelve thousand, six hundred five".