745005557 has 4 divisors (see below), whose sum is σ = 745081920. Its totient is φ = 744929196.

The previous prime is 745005529. The next prime is 745005559. The reversal of 745005557 is 755500547.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 755500547 = 29 ⋅26051743.

It is a cyclic number.

It is not a de Polignac number, because 745005557 - 2¹² = 745001461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 745005557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745005559) 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, 20957 + ... + 43922.

It is an arithmetic number, because the mean of its divisors is an integer number (186270480).

Almost surely, 2^745005557 is an apocalyptic number.

It is an amenable number.

745005557 is a deficient number, since it is larger than the sum of its proper divisors (76363).

745005557 is a wasteful number, since it uses less digits than its factorization.

745005557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76362.

The product of its (nonzero) digits is 122500, while the sum is 38.

The square root of 745005557 is about 27294.7899240862. The cubic root of 745005557 is about 906.5390240912.

The spelling of 745005557 in words is "seven hundred forty-five million, five thousand, five hundred fifty-seven".