19647606747 has 4 divisors (see below), whose sum is σ = 26196809000. Its totient is φ = 13098404496.

The previous prime is 19647606743. The next prime is 19647606791. The reversal of 19647606747 is 74760674691.

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

It is not a de Polignac number, because 19647606747 - 2² = 19647606743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19647606743) 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, 3274601122 + ... + 3274601127.

It is an arithmetic number, because the mean of its divisors is an integer number (6549202250).

Almost surely, 2^19647606747 is an apocalyptic number.

19647606747 is a deficient number, since it is larger than the sum of its proper divisors (6549202253).

19647606747 is an equidigital number, since it uses as much as digits as its factorization.

19647606747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6549202252.

The product of its (nonzero) digits is 10668672, while the sum is 57.

The spelling of 19647606747 in words is "nineteen billion, six hundred forty-seven million, six hundred six thousand, seven hundred forty-seven".