634574776621 has 8 divisors (see below), whose sum is σ = 656697295800. Its totient is φ = 612468299520.

The previous prime is 634574776613. The next prime is 634574776631. The reversal of 634574776621 is 126677475436.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 75123135396 + 559451641225 = 274086^2 + 747965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 634574776621 - 2³ = 634574776613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634574776631) 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 7 ways as a sum of consecutive naturals, for example, 3930000 + ... + 4088281.

It is an arithmetic number, because the mean of its divisors is an integer number (82087161975).

Almost surely, 2^634574776621 is an apocalyptic number.

It is an amenable number.

634574776621 is a deficient number, since it is larger than the sum of its proper divisors (22122519179).

634574776621 is a wasteful number, since it uses less digits than its factorization.

634574776621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8021039.

The product of its digits is 35562240, while the sum is 58.

The spelling of 634574776621 in words is "six hundred thirty-four billion, five hundred seventy-four million, seven hundred seventy-six thousand, six hundred twenty-one".