19456440697 has 4 divisors (see below), whose sum is σ = 19456737700. Its totient is φ = 19456143696.

The previous prime is 19456440691. The next prime is 19456440701. The reversal of 19456440697 is 79604465491.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2996577081 + 16459863616 = 54741^2 + 128296^2 .

It is a cyclic number.

It is not a de Polignac number, because 19456440697 - 2³¹ = 17308957049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19456440691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178 + ... + 197275.

It is an arithmetic number, because the mean of its divisors is an integer number (4864184425).

Almost surely, 2^19456440697 is an apocalyptic number.

It is an amenable number.

19456440697 is a deficient number, since it is larger than the sum of its proper divisors (297003).

19456440697 is an equidigital number, since it uses as much as digits as its factorization.

19456440697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297002.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 19456440697 in words is "nineteen billion, four hundred fifty-six million, four hundred forty thousand, six hundred ninety-seven".