634773749281 has 16 divisors (see below), whose sum is σ = 767513957760. Its totient is φ = 512838829440.

The previous prime is 634773749263. The next prime is 634773749293. The reversal of 634773749281 is 182947377436.

It is a happy number.

It is not a de Polignac number, because 634773749281 - 2⁷ = 634773749153 is a prime.

It is a super-2 number, since 2×634773749281² (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 (634773743281) 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, 12087340 + ... + 12139741.

It is an arithmetic number, because the mean of its divisors is an integer number (47969622360).

Almost surely, 2^634773749281 is an apocalyptic number.

It is an amenable number.

634773749281 is a deficient number, since it is larger than the sum of its proper divisors (132740208479).

634773749281 is a wasteful number, since it uses less digits than its factorization.

634773749281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24227304.

The product of its digits is 42674688, while the sum is 61.

The spelling of 634773749281 in words is "six hundred thirty-four billion, seven hundred seventy-three million, seven hundred forty-nine thousand, two hundred eighty-one".