16231540394 has 4 divisors (see below), whose sum is σ = 24347310594. Its totient is φ = 8115770196.

The previous prime is 16231540379. The next prime is 16231540433. The reversal of 16231540394 is 49304513261.

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

It can be written as a sum of positive squares in only one way, i.e., 16148055625 + 83484769 = 127075^2 + 9137^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4057885097 + ... + 4057885100.

Almost surely, 2^16231540394 is an apocalyptic number.

16231540394 is a deficient number, since it is larger than the sum of its proper divisors (8115770200).

16231540394 is an equidigital number, since it uses as much as digits as its factorization.

16231540394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8115770199.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 16231540394 in words is "sixteen billion, two hundred thirty-one million, five hundred forty thousand, three hundred ninety-four".