2156225265787 has 2 divisors, whose sum is σ = 2156225265788. Its totient is φ = 2156225265786.

The previous prime is 2156225265769. The next prime is 2156225265851. The reversal of 2156225265787 is 7875625226512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156225265787 - 2²³ = 2156216877179 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156225265767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078112632893 + 1078112632894.

It is an arithmetic number, because the mean of its divisors is an integer number (1078112632894).

Almost surely, 2^{2156225265787} is an apocalyptic number.

2156225265787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156225265787 is an equidigital number, since it uses as much as digits as its factorization.

2156225265787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224000, while the sum is 58.

The spelling of 2156225265787 in words is "two trillion, one hundred fifty-six billion, two hundred twenty-five million, two hundred sixty-five thousand, seven hundred eighty-seven".