19947451715 has 8 divisors (see below), whose sum is σ = 23940744480. Its totient is φ = 15955426432.

The previous prime is 19947451703. The next prime is 19947451717. The reversal of 19947451715 is 51715474991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19947451715 - 2³⁰ = 18873709891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19947451717) 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 7 ways as a sum of consecutive naturals, for example, 281894 + ... + 345483.

It is an arithmetic number, because the mean of its divisors is an integer number (2992593060).

Almost surely, 2^19947451715 is an apocalyptic number.

19947451715 is a deficient number, since it is larger than the sum of its proper divisors (3993292765).

19947451715 is an equidigital number, since it uses as much as digits as its factorization.

19947451715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633741.

The product of its digits is 1587600, while the sum is 53.

The spelling of 19947451715 in words is "nineteen billion, nine hundred forty-seven million, four hundred fifty-one thousand, seven hundred fifteen".