20151451405 has 4 divisors (see below), whose sum is σ = 24181741692. Its totient is φ = 16121161120.

The previous prime is 20151451391. The next prime is 20151451457. The reversal of 20151451405 is 50415415102.

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 12545344036 + 7606107369 = 112006^2 + 87213^2 .

It is not a de Polignac number, because 20151451405 - 2⁵ = 20151451373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2015145136 + ... + 2015145145.

It is an arithmetic number, because the mean of its divisors is an integer number (6045435423).

Almost surely, 2^20151451405 is an apocalyptic number.

It is an amenable number.

20151451405 is a deficient number, since it is larger than the sum of its proper divisors (4030290287).

20151451405 is an equidigital number, since it uses as much as digits as its factorization.

20151451405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030290286.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 20151451405 its reverse (50415415102), we get a palindrome (70566866507).

The spelling of 20151451405 in words is "twenty billion, one hundred fifty-one million, four hundred fifty-one thousand, four hundred five".