19734019065 has 28 divisors (see below), whose sum is σ = 35504998884. Its totient is φ = 10524808224.

The previous prime is 19734019061. The next prime is 19734019103. The reversal of 19734019065 is 56091043791.

It can be written as a sum of positive squares in 2 ways, for example, as 15365337849 + 4368681216 = 123957^2 + 66096^2 .

It is not a de Polignac number, because 19734019065 - 2² = 19734019061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19734019065.

It is not an unprimeable number, because it can be changed into a prime (19734019061) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2703354 + ... + 2710643.

Almost surely, 2^19734019065 is an apocalyptic number.

19734019065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19734019065 is a deficient number, since it is larger than the sum of its proper divisors (15770979819).

19734019065 is an frugal number, since it uses more digits than its factorization.

19734019065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5414020 (or 5414005 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 19734019065 in words is "nineteen billion, seven hundred thirty-four million, nineteen thousand, sixty-five".