2158623967537 has 2 divisors, whose sum is σ = 2158623967538. Its totient is φ = 2158623967536.

The previous prime is 2158623967529. The next prime is 2158623967547. The reversal of 2158623967537 is 7357693268512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2157488007921 + 1135959616 = 1468839^2 + 33704^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158623967537 - 2³ = 2158623967529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2158623967547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079311983768 + 1079311983769.

It is an arithmetic number, because the mean of its divisors is an integer number (1079311983769).

Almost surely, 2^{2158623967537} is an apocalyptic number.

It is an amenable number.

2158623967537 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158623967537 is an equidigital number, since it uses as much as digits as its factorization.

2158623967537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114307200, while the sum is 64.

The spelling of 2158623967537 in words is "two trillion, one hundred fifty-eight billion, six hundred twenty-three million, nine hundred sixty-seven thousand, five hundred thirty-seven".