438748266621631 has 2 divisors, whose sum is σ = 438748266621632. Its totient is φ = 438748266621630.

The previous prime is 438748266621629. The next prime is 438748266621817. The reversal of 438748266621631 is 136126662847834.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 438748266621631 - 2¹ = 438748266621629 is a prime.

It is a super-2 number, since 2×438748266621631² (a number of 30 digits) contains 22 as substring.

Together with 438748266621629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438748266628631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219374133310815 + 219374133310816.

It is an arithmetic number, because the mean of its divisors is an integer number (219374133310816).

Almost surely, 2^{438748266621631} is an apocalyptic number.

438748266621631 is a deficient number, since it is larger than the sum of its proper divisors (1).

438748266621631 is an equidigital number, since it uses as much as digits as its factorization.

438748266621631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 334430208, while the sum is 67.

The spelling of 438748266621631 in words is "four hundred thirty-eight trillion, seven hundred forty-eight billion, two hundred sixty-six million, six hundred twenty-one thousand, six hundred thirty-one".