451655473921 has 2 divisors, whose sum is σ = 451655473922. Its totient is φ = 451655473920.

The previous prime is 451655473873. The next prime is 451655473931. The reversal of 451655473921 is 129374556154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446576773696 + 5078700225 = 668264^2 + 71265^2 .

It is a cyclic number.

It is not a de Polignac number, because 451655473921 - 2⁷ = 451655473793 is a prime.

It is a super-2 number, since 2×451655473921² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (451655473931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225827736960 + 225827736961.

It is an arithmetic number, because the mean of its divisors is an integer number (225827736961).

Almost surely, 2^451655473921 is an apocalyptic number.

It is an amenable number.

451655473921 is a deficient number, since it is larger than the sum of its proper divisors (1).

451655473921 is an equidigital number, since it uses as much as digits as its factorization.

451655473921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536000, while the sum is 52.

The spelling of 451655473921 in words is "four hundred fifty-one billion, six hundred fifty-five million, four hundred seventy-three thousand, nine hundred twenty-one".