447681450781 has 4 divisors (see below), whose sum is σ = 447682860000. Its totient is φ = 447680041564.

The previous prime is 447681450767. The next prime is 447681450817. The reversal of 447681450781 is 187054186744.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 447681450781 - 2¹⁵ = 447681418013 is a prime.

It is a super-2 number, since 2×447681450781² (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 (447681450721) 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, 20970 + ... + 946468.

It is an arithmetic number, because the mean of its divisors is an integer number (111920715000).

Almost surely, 2^447681450781 is an apocalyptic number.

It is an amenable number.

447681450781 is a deficient number, since it is larger than the sum of its proper divisors (1409219).

447681450781 is an equidigital number, since it uses as much as digits as its factorization.

447681450781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409218.

The product of its (nonzero) digits is 6021120, while the sum is 55.

The spelling of 447681450781 in words is "four hundred forty-seven billion, six hundred eighty-one million, four hundred fifty thousand, seven hundred eighty-one".