451785978829 has 4 divisors (see below), whose sum is σ = 451798013884. Its totient is φ = 451773943776.

The previous prime is 451785978823. The next prime is 451785978851. The reversal of 451785978829 is 928879587154.

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 249902009604 + 201883969225 = 499902^2 + 449315^2 .

It is a cyclic number.

It is not a de Polignac number, because 451785978829 - 2²¹ = 451783881677 is a prime.

It is a super-2 number, since 2×451785978829² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451785978823) 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, 5961042 + ... + 6036355.

It is an arithmetic number, because the mean of its divisors is an integer number (112949503471).

Almost surely, 2^451785978829 is an apocalyptic number.

It is an amenable number.

451785978829 is a deficient number, since it is larger than the sum of its proper divisors (12035055).

451785978829 is a wasteful number, since it uses less digits than its factorization.

451785978829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12035054.

The product of its digits is 406425600, while the sum is 73.

The spelling of 451785978829 in words is "four hundred fifty-one billion, seven hundred eighty-five million, nine hundred seventy-eight thousand, eight hundred twenty-nine".