2156124154609 has 2 divisors, whose sum is σ = 2156124154610. Its totient is φ = 2156124154608.

The previous prime is 2156124154571. The next prime is 2156124154663. The reversal of 2156124154609 is 9064514216512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1814947840000 + 341176314609 = 1347200^2 + 584103^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156124154609 - 2²³ = 2156115766001 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156124154109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078062077304 + 1078062077305.

It is an arithmetic number, because the mean of its divisors is an integer number (1078062077305).

Almost surely, 2^{2156124154609} is an apocalyptic number.

It is an amenable number.

2156124154609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156124154609 is an equidigital number, since it uses as much as digits as its factorization.

2156124154609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 2156124154609 in words is "two trillion, one hundred fifty-six billion, one hundred twenty-four million, one hundred fifty-four thousand, six hundred nine".