19746213455 has 4 divisors (see below), whose sum is σ = 23695456152. Its totient is φ = 15796970760.

The previous prime is 19746213373. The next prime is 19746213511. The reversal of 19746213455 is 55431264791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 19746213455 - 2⁸ = 19746213199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1974621341 + ... + 1974621350.

It is an arithmetic number, because the mean of its divisors is an integer number (5923864038).

Almost surely, 2^19746213455 is an apocalyptic number.

19746213455 is a deficient number, since it is larger than the sum of its proper divisors (3949242697).

19746213455 is an equidigital number, since it uses as much as digits as its factorization.

19746213455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949242696.

The product of its digits is 907200, while the sum is 47.

The spelling of 19746213455 in words is "nineteen billion, seven hundred forty-six million, two hundred thirteen thousand, four hundred fifty-five".