20158072465 has 4 divisors (see below), whose sum is σ = 24189686964. Its totient is φ = 16126457968.

The previous prime is 20158072447. The next prime is 20158072471. The reversal of 20158072465 is 56427085102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14585151361 + 5572921104 = 120769^2 + 74652^2 .

It is a cyclic number.

It is not a de Polignac number, because 20158072465 - 2¹³ = 20158064273 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015807242 + ... + 2015807251.

It is an arithmetic number, because the mean of its divisors is an integer number (6047421741).

Almost surely, 2^20158072465 is an apocalyptic number.

It is an amenable number.

20158072465 is a deficient number, since it is larger than the sum of its proper divisors (4031614499).

20158072465 is an equidigital number, since it uses as much as digits as its factorization.

20158072465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031614498.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 20158072465 in words is "twenty billion, one hundred fifty-eight million, seventy-two thousand, four hundred sixty-five".