19826077457 has 2 divisors, whose sum is σ = 19826077458. Its totient is φ = 19826077456.

The previous prime is 19826077429. The next prime is 19826077477. The reversal of 19826077457 is 75477062891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14275231441 + 5550846016 = 119479^2 + 74504^2 .

It is a cyclic number.

It is not a de Polignac number, because 19826077457 - 2²² = 19821883153 is a prime.

It is not a weakly prime, because it can be changed into another prime (19826077477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9913038728 + 9913038729.

It is an arithmetic number, because the mean of its divisors is an integer number (9913038729).

Almost surely, 2^19826077457 is an apocalyptic number.

It is an amenable number.

19826077457 is a deficient number, since it is larger than the sum of its proper divisors (1).

19826077457 is an equidigital number, since it uses as much as digits as its factorization.

19826077457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 19826077457 in words is "nineteen billion, eight hundred twenty-six million, seventy-seven thousand, four hundred fifty-seven".