2156304215461 has 4 divisors (see below), whose sum is σ = 2352331871424. Its totient is φ = 1960276559500.

The previous prime is 2156304215447. The next prime is 2156304215467. The reversal of 2156304215461 is 1645124036512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2156304215461 - 2²⁵ = 2156270661029 is a prime.

It is a super-2 number, since 2×2156304215461² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156304215467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98013827965 + ... + 98013827986.

It is an arithmetic number, because the mean of its divisors is an integer number (588082967856).

Almost surely, 2^{2156304215461} is an apocalyptic number.

It is an amenable number.

2156304215461 is a deficient number, since it is larger than the sum of its proper divisors (196027655963).

2156304215461 is a wasteful number, since it uses less digits than its factorization.

2156304215461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196027655962.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 2156304215461 in words is "two trillion, one hundred fifty-six billion, three hundred four million, two hundred fifteen thousand, four hundred sixty-one".