19640710943 has 4 divisors (see below), whose sum is σ = 22446526800. Its totient is φ = 16834895088.

The previous prime is 19640710939. The next prime is 19640710961. The reversal of 19640710943 is 34901704691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34901704691 = 7 ⋅4985957813.

It is a cyclic number.

It is not a de Polignac number, because 19640710943 - 2² = 19640710939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19640710894 and 19640710903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19640710043) 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, 1402907918 + ... + 1402907931.

It is an arithmetic number, because the mean of its divisors is an integer number (5611631700).

Almost surely, 2^19640710943 is an apocalyptic number.

19640710943 is a deficient number, since it is larger than the sum of its proper divisors (2805815857).

19640710943 is an equidigital number, since it uses as much as digits as its factorization.

19640710943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805815856.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 19640710943 in words is "nineteen billion, six hundred forty million, seven hundred ten thousand, nine hundred forty-three".