451464489521 has 4 divisors (see below), whose sum is σ = 458202765552. Its totient is φ = 444726213492.

The previous prime is 451464489479. The next prime is 451464489523. The reversal of 451464489521 is 125984464154.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 451464489521 - 2²² = 451460295217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451464489523) 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, 3369137915 + ... + 3369138048.

It is an arithmetic number, because the mean of its divisors is an integer number (114550691388).

Almost surely, 2^451464489521 is an apocalyptic number.

It is an amenable number.

451464489521 is a deficient number, since it is larger than the sum of its proper divisors (6738276031).

451464489521 is an equidigital number, since it uses as much as digits as its factorization.

451464489521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738276030.

The product of its digits is 5529600, while the sum is 53.

The spelling of 451464489521 in words is "four hundred fifty-one billion, four hundred sixty-four million, four hundred eighty-nine thousand, five hundred twenty-one".