1631661366 has 32 divisors (see below), whose sum is σ = 3483475200. Its totient is φ = 508001760.

The previous prime is 1631661349. The next prime is 1631661391. The reversal of 1631661366 is 6631661361.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92701 + ... + 108888.

It is an arithmetic number, because the mean of its divisors is an integer number (108858600).

Almost surely, 2^1631661366 is an apocalyptic number.

1631661366 is an abundant number, since it is smaller than the sum of its proper divisors (1851813834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1631661366 is a wasteful number, since it uses less digits than its factorization.

1631661366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201684.

The product of its digits is 69984, while the sum is 39.

The square root of 1631661366 is about 40393.8283157217. The cubic root of 1631661366 is about 1177.2716255997.

The spelling of 1631661366 in words is "one billion, six hundred thirty-one million, six hundred sixty-one thousand, three hundred sixty-six".