745040423155421 has 2 divisors, whose sum is σ = 745040423155422. Its totient is φ = 745040423155420.

The previous prime is 745040423155363. The next prime is 745040423155517. The reversal of 745040423155421 is 124551324040547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637188147967396 + 107852275188025 = 25242586^2 + 10385195^2 .

It is a cyclic number.

It is not a de Polignac number, because 745040423155421 - 2²⁶ = 745040356046557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745040423155321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372520211577710 + 372520211577711.

It is an arithmetic number, because the mean of its divisors is an integer number (372520211577711).

Almost surely, 2^{745040423155421} is an apocalyptic number.

It is an amenable number.

745040423155421 is a deficient number, since it is larger than the sum of its proper divisors (1).

745040423155421 is an equidigital number, since it uses as much as digits as its factorization.

745040423155421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688000, while the sum is 47.

Adding to 745040423155421 its reverse (124551324040547), we get a palindrome (869591747195968).

The spelling of 745040423155421 in words is "seven hundred forty-five trillion, forty billion, four hundred twenty-three million, one hundred fifty-five thousand, four hundred twenty-one".