745046366501621 has 2 divisors, whose sum is σ = 745046366501622. Its totient is φ = 745046366501620.

The previous prime is 745046366501611. The next prime is 745046366501623. The reversal of 745046366501621 is 126105663640547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624759323174596 + 120287043327025 = 24995186^2 + 10967545^2 .

It is a cyclic number.

It is not a de Polignac number, because 745046366501621 - 2⁴² = 740648319990517 is a prime.

Together with 745046366501623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745046366501623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372523183250810 + 372523183250811.

It is an arithmetic number, because the mean of its divisors is an integer number (372523183250811).

Almost surely, 2^{745046366501621} is an apocalyptic number.

It is an amenable number.

745046366501621 is a deficient number, since it is larger than the sum of its proper divisors (1).

745046366501621 is an equidigital number, since it uses as much as digits as its factorization.

745046366501621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 745046366501621 in words is "seven hundred forty-five trillion, forty-six billion, three hundred sixty-six million, five hundred one thousand, six hundred twenty-one".