1994709661 has 16 divisors (see below), whose sum is σ = 2503987200. Its totient is φ = 1549337328.

The previous prime is 1994709653. The next prime is 1994709677. The reversal of 1994709661 is 1669074991.

It is not a de Polignac number, because 1994709661 - 2³ = 1994709653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1994709599 and 1994709608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994709611) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 322981 + ... + 329098.

It is an arithmetic number, because the mean of its divisors is an integer number (156499200).

Almost surely, 2^1994709661 is an apocalyptic number.

It is an amenable number.

1994709661 is a deficient number, since it is larger than the sum of its proper divisors (509277539).

1994709661 is a wasteful number, since it uses less digits than its factorization.

1994709661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652128.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 1994709661 is about 44662.1725960572. The cubic root of 1994709661 is about 1258.8091673674.

The spelling of 1994709661 in words is "one billion, nine hundred ninety-four million, seven hundred nine thousand, six hundred sixty-one".