450781909369921 has 4 divisors (see below), whose sum is σ = 477298492274052. Its totient is φ = 424265326465792.

The previous prime is 450781909369873. The next prime is 450781909369943. The reversal of 450781909369921 is 129963909187054.

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 250620561000000 + 200161348369921 = 15831000^2 + 14147839^2 .

It is a cyclic number.

It is not a de Polignac number, because 450781909369921 - 2²⁷ = 450781775152193 is a prime.

It is a super-3 number, since 3×450781909369921³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (450781909364921) 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, 13258291452040 + ... + 13258291452073.

It is an arithmetic number, because the mean of its divisors is an integer number (119324623068513).

It is a 3-persistent number, because k⋅450781909369921 is pandigital for 1 ≤ k ≤ 3, but not for k = 4.

Almost surely, 2^{450781909369921} is an apocalyptic number.

It is an amenable number.

450781909369921 is a deficient number, since it is larger than the sum of its proper divisors (26516582904131).

450781909369921 is a wasteful number, since it uses less digits than its factorization.

450781909369921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26516582904130.

The product of its (nonzero) digits is 264539520, while the sum is 73.

The spelling of 450781909369921 in words is "four hundred fifty trillion, seven hundred eighty-one billion, nine hundred nine million, three hundred sixty-nine thousand, nine hundred twenty-one".