626319381949 has 4 divisors (see below), whose sum is σ = 626335150140. Its totient is φ = 626303613760.

The previous prime is 626319381917. The next prime is 626319382061. The reversal of 626319381949 is 949183913626.

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 246502320100 + 379817061849 = 496490^2 + 616293^2 .

It is a cyclic number.

It is not a de Polignac number, because 626319381949 - 2⁵ = 626319381917 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 (626319381349) 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, 7824364 + ... + 7904005.

It is an arithmetic number, because the mean of its divisors is an integer number (156583787535).

Almost surely, 2^626319381949 is an apocalyptic number.

It is an amenable number.

626319381949 is a deficient number, since it is larger than the sum of its proper divisors (15768191).

626319381949 is a wasteful number, since it uses less digits than its factorization.

626319381949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15768190.

The product of its digits is 15116544, while the sum is 61.

The spelling of 626319381949 in words is "six hundred twenty-six billion, three hundred nineteen million, three hundred eighty-one thousand, nine hundred forty-nine".