67157945 has 4 divisors (see below), whose sum is σ = 80589540. Its totient is φ = 53726352.

The previous prime is 67157941. The next prime is 67157947. The reversal of 67157945 is 54975176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50282281 + 16875664 = 7091^2 + 4108^2 .

It is a cyclic number.

It is not a de Polignac number, because 67157945 - 2² = 67157941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 67157896 and 67157905.

It is not an unprimeable number, because it can be changed into a prime (67157941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6715790 + ... + 6715799.

It is an arithmetic number, because the mean of its divisors is an integer number (20147385).

Almost surely, 2^67157945 is an apocalyptic number.

It is an amenable number.

67157945 is a deficient number, since it is larger than the sum of its proper divisors (13431595).

67157945 is a wasteful number, since it uses less digits than its factorization.

67157945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13431594.

The product of its digits is 264600, while the sum is 44.

The square root of 67157945 is about 8194.9951189735. The cubic root of 67157945 is about 406.4737144151.

The spelling of 67157945 in words is "sixty-seven million, one hundred fifty-seven thousand, nine hundred forty-five".