20150223851 has 16 divisors (see below), whose sum is σ = 21479377920. Its totient is φ = 18871846560.

The previous prime is 20150223839. The next prime is 20150223853. The reversal of 20150223851 is 15832205102.

It is a cyclic number.

It is not a de Polignac number, because 20150223851 - 2¹⁸ = 20149961707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20150223853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75956 + ... + 214638.

It is an arithmetic number, because the mean of its divisors is an integer number (1342461120).

Almost surely, 2^20150223851 is an apocalyptic number.

20150223851 is a deficient number, since it is larger than the sum of its proper divisors (1329154069).

20150223851 is a wasteful number, since it uses less digits than its factorization.

20150223851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138866.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 20150223851 its reverse (15832205102), we get a palindrome (35982428953).

The spelling of 20150223851 in words is "twenty billion, one hundred fifty million, two hundred twenty-three thousand, eight hundred fifty-one".