12644032537 has 2 divisors, whose sum is σ = 12644032538. Its totient is φ = 12644032536.

The previous prime is 12644032519. The next prime is 12644032553. The reversal of 12644032537 is 73523044621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12526981776 + 117050761 = 111924^2 + 10819^2 .

It is a cyclic number.

It is not a de Polignac number, because 12644032537 - 2⁷ = 12644032409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12644032496 and 12644032505.

It is not a weakly prime, because it can be changed into another prime (12644132537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322016268 + 6322016269.

It is an arithmetic number, because the mean of its divisors is an integer number (6322016269).

Almost surely, 2^12644032537 is an apocalyptic number.

It is an amenable number.

12644032537 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644032537 is an equidigital number, since it uses as much as digits as its factorization.

12644032537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 12644032537 in words is "twelve billion, six hundred forty-four million, thirty-two thousand, five hundred thirty-seven".