17945269477 has 2 divisors, whose sum is σ = 17945269478. Its totient is φ = 17945269476.

The previous prime is 17945269393. The next prime is 17945269501. The reversal of 17945269477 is 77496254971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14906944836 + 3038324641 = 122094^2 + 55121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17945269477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17945269877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8972634738 + 8972634739.

It is an arithmetic number, because the mean of its divisors is an integer number (8972634739).

Almost surely, 2^17945269477 is an apocalyptic number.

It is an amenable number.

17945269477 is a deficient number, since it is larger than the sum of its proper divisors (1).

17945269477 is an equidigital number, since it uses as much as digits as its factorization.

17945269477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26671680, while the sum is 61.

The spelling of 17945269477 in words is "seventeen billion, nine hundred forty-five million, two hundred sixty-nine thousand, four hundred seventy-seven".