14778832457 has 2 divisors, whose sum is σ = 14778832458. Its totient is φ = 14778832456.

The previous prime is 14778832447. The next prime is 14778832469. The reversal of 14778832457 is 75423887741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13664674816 + 1114157641 = 116896^2 + 33379^2 .

It is a cyclic number.

It is not a de Polignac number, because 14778832457 - 2²⁸ = 14510397001 is a prime.

It is not a weakly prime, because it can be changed into another prime (14778832417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7389416228 + 7389416229.

It is an arithmetic number, because the mean of its divisors is an integer number (7389416229).

Almost surely, 2^14778832457 is an apocalyptic number.

It is an amenable number.

14778832457 is a deficient number, since it is larger than the sum of its proper divisors (1).

14778832457 is an equidigital number, since it uses as much as digits as its factorization.

14778832457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10536960, while the sum is 56.

The spelling of 14778832457 in words is "fourteen billion, seven hundred seventy-eight million, eight hundred thirty-two thousand, four hundred fifty-seven".