157778713 has 2 divisors, whose sum is σ = 157778714. Its totient is φ = 157778712.

The previous prime is 157778711. The next prime is 157778729. The reversal of 157778713 is 317877751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103063104 + 54715609 = 10152^2 + 7397^2 .

It is a cyclic number.

It is not a de Polignac number, because 157778713 - 2¹ = 157778711 is a prime.

Together with 157778711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (157778711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78889356 + 78889357.

It is an arithmetic number, because the mean of its divisors is an integer number (78889357).

Almost surely, 2^157778713 is an apocalyptic number.

It is an amenable number.

157778713 is a deficient number, since it is larger than the sum of its proper divisors (1).

157778713 is an equidigital number, since it uses as much as digits as its factorization.

157778713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288120, while the sum is 46.

The square root of 157778713 is about 12560.9996815540. Note that the first 3 decimals coincide. The cubic root of 157778713 is about 540.3595148229.

The spelling of 157778713 in words is "one hundred fifty-seven million, seven hundred seventy-eight thousand, seven hundred thirteen".