634268091691 has 16 divisors (see below), whose sum is σ = 699415230976. Its totient is φ = 571476106656.

The previous prime is 634268091661. The next prime is 634268091727. The reversal of 634268091691 is 196190862436.

It is a happy number.

It is not a de Polignac number, because 634268091691 - 2¹¹ = 634268089643 is a prime.

It is the 796410-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634268091661) by changing a digit.

It is a nontrivial repunit in base 796409.

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, 446446 + ... + 1211548.

It is an arithmetic number, because the mean of its divisors is an integer number (43713451936).

Almost surely, 2^634268091691 is an apocalyptic number.

634268091691 is a deficient number, since it is larger than the sum of its proper divisors (65147139285).

634268091691 is a wasteful number, since it uses less digits than its factorization.

634268091691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766642.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 634268091691 in words is "six hundred thirty-four billion, two hundred sixty-eight million, ninety-one thousand, six hundred ninety-one".