19426416257 has 4 divisors (see below), whose sum is σ = 19427330496. Its totient is φ = 19425502020.

The previous prime is 19426416227. The next prime is 19426416263. The reversal of 19426416257 is 75261462491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75261462491 = 491 ⋅153282001.

It is a cyclic number.

It is not a de Polignac number, because 19426416257 - 2¹⁸ = 19426154113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19426416227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424469 + ... + 468002.

It is an arithmetic number, because the mean of its divisors is an integer number (4856832624).

Almost surely, 2^19426416257 is an apocalyptic number.

It is an amenable number.

19426416257 is a deficient number, since it is larger than the sum of its proper divisors (914239).

19426416257 is an equidigital number, since it uses as much as digits as its factorization.

19426416257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914238.

The product of its digits is 725760, while the sum is 47.

The spelling of 19426416257 in words is "nineteen billion, four hundred twenty-six million, four hundred sixteen thousand, two hundred fifty-seven".