438620629561 has 2 divisors, whose sum is σ = 438620629562. Its totient is φ = 438620629560.

The previous prime is 438620629549. The next prime is 438620629571. The reversal of 438620629561 is 165926026834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435163189561 + 3457440000 = 659669^2 + 58800^2 .

It is a cyclic number.

It is not a de Polignac number, because 438620629561 - 2²¹ = 438618532409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 438620629499 and 438620629508.

It is not a weakly prime, because it can be changed into another prime (438620629511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219310314780 + 219310314781.

It is an arithmetic number, because the mean of its divisors is an integer number (219310314781).

Almost surely, 2^438620629561 is an apocalyptic number.

It is an amenable number.

438620629561 is a deficient number, since it is larger than the sum of its proper divisors (1).

438620629561 is an equidigital number, since it uses as much as digits as its factorization.

438620629561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 438620629561 in words is "four hundred thirty-eight billion, six hundred twenty million, six hundred twenty-nine thousand, five hundred sixty-one".