491880161806 has 16 divisors (see below), whose sum is σ = 812417195520. Its totient is φ = 221492340280.

The previous prime is 491880161803. The next prime is 491880161819. The reversal of 491880161806 is 608161088194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491880161803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104475166 + ... + 104479873.

It is an arithmetic number, because the mean of its divisors is an integer number (50776074720).

Almost surely, 2^491880161806 is an apocalyptic number.

491880161806 is a deficient number, since it is larger than the sum of its proper divisors (320537033714).

491880161806 is a wasteful number, since it uses less digits than its factorization.

491880161806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208955159.

The product of its (nonzero) digits is 663552, while the sum is 52.

The spelling of 491880161806 in words is "four hundred ninety-one billion, eight hundred eighty million, one hundred sixty-one thousand, eight hundred six".