634256746481 has 4 divisors (see below), whose sum is σ = 634683282432. Its totient is φ = 633830210532.

The previous prime is 634256746423. The next prime is 634256746483. The reversal of 634256746481 is 184647652436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634256746481 - 2³⁸ = 359378839537 is a prime.

It is a super-2 number, since 2×634256746481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634256746483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213265745 + ... + 213268718.

It is an arithmetic number, because the mean of its divisors is an integer number (158670820608).

Almost surely, 2^634256746481 is an apocalyptic number.

It is an amenable number.

634256746481 is a deficient number, since it is larger than the sum of its proper divisors (426535951).

634256746481 is a wasteful number, since it uses less digits than its factorization.

634256746481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426535950.

The product of its digits is 23224320, while the sum is 56.

The spelling of 634256746481 in words is "six hundred thirty-four billion, two hundred fifty-six million, seven hundred forty-six thousand, four hundred eighty-one".