2156051520461 has 2 divisors, whose sum is σ = 2156051520462. Its totient is φ = 2156051520460.

The previous prime is 2156051520421. The next prime is 2156051520503. The reversal of 2156051520461 is 1640251506512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1823226372361 + 332825148100 = 1350269^2 + 576910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156051520461 - 2¹⁴ = 2156051504077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156051520421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078025760230 + 1078025760231.

It is an arithmetic number, because the mean of its divisors is an integer number (1078025760231).

Almost surely, 2^{2156051520461} is an apocalyptic number.

It is an amenable number.

2156051520461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156051520461 is an equidigital number, since it uses as much as digits as its factorization.

2156051520461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 2156051520461 in words is "two trillion, one hundred fifty-six billion, fifty-one million, five hundred twenty thousand, four hundred sixty-one".