626401434129409 has 4 divisors (see below), whose sum is σ = 626683469896660. Its totient is φ = 626119398362160.

The previous prime is 626401434129269. The next prime is 626401434129461. The reversal of 626401434129409 is 904921434104626.

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 140876603031025 + 485524831098384 = 11869145^2 + 22034628^2 .

It is a cyclic number.

It is not a de Polignac number, because 626401434129409 - 2²³ = 626401425740801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 626401434129409.

It is not an unprimeable number, because it can be changed into a prime (626401434124409) 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, 141017880294 + ... + 141017884735.

It is an arithmetic number, because the mean of its divisors is an integer number (156670867474165).

Almost surely, 2^{626401434129409} is an apocalyptic number.

It is an amenable number.

626401434129409 is a deficient number, since it is larger than the sum of its proper divisors (282035767251).

626401434129409 is a wasteful number, since it uses less digits than its factorization.

626401434129409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282035767250.

The product of its (nonzero) digits is 8957952, while the sum is 55.

The spelling of 626401434129409 in words is "six hundred twenty-six trillion, four hundred one billion, four hundred thirty-four million, one hundred twenty-nine thousand, four hundred nine".