16157581249 has 2 divisors, whose sum is σ = 16157581250. Its totient is φ = 16157581248.

The previous prime is 16157581157. The next prime is 16157581267. The reversal of 16157581249 is 94218575161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14392321024 + 1765260225 = 119968^2 + 42015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16157581249 is a prime.

It is a super-2 number, since 2×16157581249² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16157581289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8078790624 + 8078790625.

It is an arithmetic number, because the mean of its divisors is an integer number (8078790625).

Almost surely, 2^16157581249 is an apocalyptic number.

It is an amenable number.

16157581249 is a deficient number, since it is larger than the sum of its proper divisors (1).

16157581249 is an equidigital number, since it uses as much as digits as its factorization.

16157581249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The spelling of 16157581249 in words is "sixteen billion, one hundred fifty-seven million, five hundred eighty-one thousand, two hundred forty-nine".