19831478065 has 8 divisors (see below), whose sum is σ = 27197455680. Its totient is φ = 13598727792.

The previous prime is 19831478063. The next prime is 19831478081. The reversal of 19831478065 is 56087413891.

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 19831478065 - 2¹ = 19831478063 is a prime.

It is a super-2 number, since 2×19831478065² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19831478063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283306795 + ... + 283306864.

It is an arithmetic number, because the mean of its divisors is an integer number (3399681960).

Almost surely, 2^19831478065 is an apocalyptic number.

It is an amenable number.

19831478065 is a deficient number, since it is larger than the sum of its proper divisors (7365977615).

19831478065 is an equidigital number, since it uses as much as digits as its factorization.

19831478065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566613671.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 19831478065 in words is "nineteen billion, eight hundred thirty-one million, four hundred seventy-eight thousand, sixty-five".