745720161 has 8 divisors (see below), whose sum is σ = 997298784. Its totient is φ = 495644160.

The previous prime is 745720153. The next prime is 745720169. The reversal of 745720161 is 161027547.

It is an interprime number because it is at equal distance from previous prime (745720153) and next prime (745720169).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 745720161 - 2³ = 745720153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (745720169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374496 + ... + 376481.

It is an arithmetic number, because the mean of its divisors is an integer number (124662348).

Almost surely, 2^745720161 is an apocalyptic number.

It is an amenable number.

745720161 is a deficient number, since it is larger than the sum of its proper divisors (251578623).

745720161 is a wasteful number, since it uses less digits than its factorization.

745720161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751311.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 745720161 is about 27307.8772701212. The cubic root of 745720161 is about 906.8287800489.

The spelling of 745720161 in words is "seven hundred forty-five million, seven hundred twenty thousand, one hundred sixty-one".