4261663467891 has 6 divisors (see below), whose sum is σ = 6155736120300. Its totient is φ = 2841108978588.

The previous prime is 4261663467847. The next prime is 4261663467907. The reversal of 4261663467891 is 1987643661624.

4261663467891 is a `hidden beast` number, since 4 + 2 + 6 + 166 + 3 + 467 + 8 + 9 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-4261663467891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4261663467811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 236759081541 + ... + 236759081558.

It is an arithmetic number, because the mean of its divisors is an integer number (1025956020050).

Almost surely, 2^{4261663467891} is an apocalyptic number.

4261663467891 is a deficient number, since it is larger than the sum of its proper divisors (1894072652409).

4261663467891 is a wasteful number, since it uses less digits than its factorization.

4261663467891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473518163105 (or 473518163102 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 4261663467891 in words is "four trillion, two hundred sixty-one billion, six hundred sixty-three million, four hundred sixty-seven thousand, eight hundred ninety-one".