634691361973 has 2 divisors, whose sum is σ = 634691361974. Its totient is φ = 634691361972.

The previous prime is 634691361943. The next prime is 634691362009. The reversal of 634691361973 is 379163196436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631107902929 + 3583459044 = 794423^2 + 59862^2 .

It is a cyclic number.

It is not a de Polignac number, because 634691361973 - 2³³ = 626101427381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634691361943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317345680986 + 317345680987.

It is an arithmetic number, because the mean of its divisors is an integer number (317345680987).

Almost surely, 2^634691361973 is an apocalyptic number.

It is an amenable number.

634691361973 is a deficient number, since it is larger than the sum of its proper divisors (1).

634691361973 is an equidigital number, since it uses as much as digits as its factorization.

634691361973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 58.

The spelling of 634691361973 in words is "six hundred thirty-four billion, six hundred ninety-one million, three hundred sixty-one thousand, nine hundred seventy-three".