451378881409 has 4 divisors (see below), whose sum is σ = 451391380804. Its totient is φ = 451366382016.

The previous prime is 451378881407. The next prime is 451378881431. The reversal of 451378881409 is 904188873154.

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 53687207025 + 397691674384 = 231705^2 + 630628^2 .

It is a cyclic number.

It is not a de Polignac number, because 451378881409 - 2¹ = 451378881407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451378881407) 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, 6195372 + ... + 6267805.

It is an arithmetic number, because the mean of its divisors is an integer number (112847845201).

Almost surely, 2^451378881409 is an apocalyptic number.

It is an amenable number.

451378881409 is a deficient number, since it is larger than the sum of its proper divisors (12499395).

451378881409 is a wasteful number, since it uses less digits than its factorization.

451378881409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12499394.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 451378881409 in words is "four hundred fifty-one billion, three hundred seventy-eight million, eight hundred eighty-one thousand, four hundred nine".