20161257427 has 4 divisors (see below), whose sum is σ = 20161557760. Its totient is φ = 20160957096.

The previous prime is 20161257421. The next prime is 20161257449. The reversal of 20161257427 is 72475216102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20161257427 - 2¹⁵ = 20161224659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20161257421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1774 + ... + 200812.

It is an arithmetic number, because the mean of its divisors is an integer number (5040389440).

Almost surely, 2^20161257427 is an apocalyptic number.

20161257427 is a deficient number, since it is larger than the sum of its proper divisors (300333).

20161257427 is a wasteful number, since it uses less digits than its factorization.

20161257427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300332.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 20161257427 in words is "twenty billion, one hundred sixty-one million, two hundred fifty-seven thousand, four hundred twenty-seven".