156605506249 has 2 divisors, whose sum is σ = 156605506250. Its totient is φ = 156605506248.

The previous prime is 156605506247. The next prime is 156605506391. The reversal of 156605506249 is 942605506651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139096923849 + 17508582400 = 372957^2 + 132320^2 .

It is a cyclic number.

It is not a de Polignac number, because 156605506249 - 2¹ = 156605506247 is a prime.

Together with 156605506247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (156605506247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78302753124 + 78302753125.

It is an arithmetic number, because the mean of its divisors is an integer number (78302753125).

Almost surely, 2^156605506249 is an apocalyptic number.

It is an amenable number.

156605506249 is a deficient number, since it is larger than the sum of its proper divisors (1).

156605506249 is an equidigital number, since it uses as much as digits as its factorization.

156605506249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 49.

The spelling of 156605506249 in words is "one hundred fifty-six billion, six hundred five million, five hundred six thousand, two hundred forty-nine".