634409523493 has 2 divisors, whose sum is σ = 634409523494. Its totient is φ = 634409523492.

The previous prime is 634409523487. The next prime is 634409523541. The reversal of 634409523493 is 394325904436.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574348748164 + 60060775329 = 757858^2 + 245073^2 .

It is a cyclic number.

It is not a de Polignac number, because 634409523493 - 2¹³ = 634409515301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634409523493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634409523443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317204761746 + 317204761747.

It is an arithmetic number, because the mean of its divisors is an integer number (317204761747).

Almost surely, 2^634409523493 is an apocalyptic number.

It is an amenable number.

634409523493 is a deficient number, since it is larger than the sum of its proper divisors (1).

634409523493 is an equidigital number, since it uses as much as digits as its factorization.

634409523493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 52.

The spelling of 634409523493 in words is "six hundred thirty-four billion, four hundred nine million, five hundred twenty-three thousand, four hundred ninety-three".