451613610821 has 2 divisors, whose sum is σ = 451613610822. Its totient is φ = 451613610820.

The previous prime is 451613610817. The next prime is 451613610869. The reversal of 451613610821 is 128016316154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396534684100 + 55078926721 = 629710^2 + 234689^2 .

It is a cyclic number.

It is not a de Polignac number, because 451613610821 - 2² = 451613610817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451613610871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225806805410 + 225806805411.

It is an arithmetic number, because the mean of its divisors is an integer number (225806805411).

Almost surely, 2^451613610821 is an apocalyptic number.

It is an amenable number.

451613610821 is a deficient number, since it is larger than the sum of its proper divisors (1).

451613610821 is an equidigital number, since it uses as much as digits as its factorization.

451613610821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

Adding to 451613610821 its reverse (128016316154), we get a palindrome (579629926975).

The spelling of 451613610821 in words is "four hundred fifty-one billion, six hundred thirteen million, six hundred ten thousand, eight hundred twenty-one".