745550788881581 has 2 divisors, whose sum is σ = 745550788881582. Its totient is φ = 745550788881580.

The previous prime is 745550788881533. The next prime is 745550788881589. The reversal of 745550788881581 is 185188887055547.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 742773429976900 + 2777358904681 = 27253870^2 + 1666541^2 .

It is an emirp because it is prime and its reverse (185188887055547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 745550788881581 - 2³⁴ = 745533609012397 is a prime.

It is a super-2 number, since 2×745550788881581² (a number of 31 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 745550788881496 and 745550788881505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745550788881589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372775394440790 + 372775394440791.

It is an arithmetic number, because the mean of its divisors is an integer number (372775394440791).

Almost surely, 2^{745550788881581} is an apocalyptic number.

It is an amenable number.

745550788881581 is a deficient number, since it is larger than the sum of its proper divisors (1).

745550788881581 is an equidigital number, since it uses as much as digits as its factorization.

745550788881581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4014080000, while the sum is 80.

The spelling of 745550788881581 in words is "seven hundred forty-five trillion, five hundred fifty billion, seven hundred eighty-eight million, eight hundred eighty-one thousand, five hundred eighty-one".