745666553 has 2 divisors, whose sum is σ = 745666554. Its totient is φ = 745666552.

The previous prime is 745666511. The next prime is 745666561. The reversal of 745666553 is 355666547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 696273769 + 49392784 = 26387^2 + 7028^2 .

It is a cyclic number.

It is not a de Polignac number, because 745666553 - 2¹² = 745662457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 745666498 and 745666507.

It is not a weakly prime, because it can be changed into another prime (745666583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372833276 + 372833277.

It is an arithmetic number, because the mean of its divisors is an integer number (372833277).

Almost surely, 2^745666553 is an apocalyptic number.

It is an amenable number.

745666553 is a deficient number, since it is larger than the sum of its proper divisors (1).

745666553 is an equidigital number, since it uses as much as digits as its factorization.

745666553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268000, while the sum is 47.

The square root of 745666553 is about 27306.8957041990. The cubic root of 745666553 is about 906.8070496266.

The spelling of 745666553 in words is "seven hundred forty-five million, six hundred sixty-six thousand, five hundred fifty-three".