20151432166 has 4 divisors (see below), whose sum is σ = 30227148252. Its totient is φ = 10075716082.

The previous prime is 20151432121. The next prime is 20151432179. The reversal of 20151432166 is 66123415102.

It is a happy number.

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

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 as a sum of consecutive naturals, namely, 5037858040 + ... + 5037858043.

It is an arithmetic number, because the mean of its divisors is an integer number (7556787063).

Almost surely, 2^20151432166 is an apocalyptic number.

20151432166 is a deficient number, since it is larger than the sum of its proper divisors (10075716086).

20151432166 is a wasteful number, since it uses less digits than its factorization.

20151432166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10075716085.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 20151432166 its reverse (66123415102), we get a palindrome (86274847268).

The spelling of 20151432166 in words is "twenty billion, one hundred fifty-one million, four hundred thirty-two thousand, one hundred sixty-six".