6394691961 has 16 divisors (see below), whose sum is σ = 10826992000. Its totient is φ = 3654109584.

The previous prime is 6394691959. The next prime is 6394691969. The reversal of 6394691961 is 1691964936.

6394691961 is a `hidden beast` number, since 6 + 394 + 69 + 196 + 1 = 666.

It is not a de Polignac number, because 6394691961 - 2¹ = 6394691959 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6394691898 and 6394691907.

It is not an unprimeable number, because it can be changed into a prime (6394691969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16916986 + ... + 16917363.

It is an arithmetic number, because the mean of its divisors is an integer number (676687000).

Almost surely, 2^6394691961 is an apocalyptic number.

It is an amenable number.

6394691961 is a deficient number, since it is larger than the sum of its proper divisors (4432300039).

6394691961 is a wasteful number, since it uses less digits than its factorization.

6394691961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33834365 (or 33834359 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 6394691961 is about 79966.8178746660. The cubic root of 6394691961 is about 1856.1221053399.

The spelling of 6394691961 in words is "six billion, three hundred ninety-four million, six hundred ninety-one thousand, nine hundred sixty-one".