634644362249 has 4 divisors (see below), whose sum is σ = 634646164740. Its totient is φ = 634642559760.

The previous prime is 634644362221. The next prime is 634644362291. The reversal of 634644362249 is 942263446436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 628384387849 + 6259974400 = 792707^2 + 79120^2 .

It is a cyclic number.

It is not a de Polignac number, because 634644362249 - 2³² = 630349394953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634644362249.

It is not an unprimeable number, because it can be changed into a prime (634644352249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181514 + ... + 1141155.

It is an arithmetic number, because the mean of its divisors is an integer number (158661541185).

Almost surely, 2^634644362249 is an apocalyptic number.

It is an amenable number.

634644362249 is a deficient number, since it is larger than the sum of its proper divisors (1802491).

634644362249 is a wasteful number, since it uses less digits than its factorization.

634644362249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802490.

The product of its digits is 17915904, while the sum is 53.

The spelling of 634644362249 in words is "six hundred thirty-four billion, six hundred forty-four million, three hundred sixty-two thousand, two hundred forty-nine".