745450661 has 4 divisors (see below), whose sum is σ = 746340000. Its totient is φ = 744561324.

The previous prime is 745450649. The next prime is 745450687. The reversal of 745450661 is 166054547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166054547 = 19 ⋅8739713.

It is a cyclic number.

It is not a de Polignac number, because 745450661 - 2¹⁰ = 745449637 is a prime.

It is a super-3 number, since 3×745450661³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745450361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443411 + ... + 445088.

It is an arithmetic number, because the mean of its divisors is an integer number (186585000).

Almost surely, 2^745450661 is an apocalyptic number.

It is an amenable number.

745450661 is a deficient number, since it is larger than the sum of its proper divisors (889339).

745450661 is an equidigital number, since it uses as much as digits as its factorization.

745450661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889338.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 745450661 is about 27302.9423505966. The cubic root of 745450661 is about 906.7195255701.

The spelling of 745450661 in words is "seven hundred forty-five million, four hundred fifty thousand, six hundred sixty-one".