67239620845 has 4 divisors (see below), whose sum is σ = 80687545020. Its totient is φ = 53791696672.

The previous prime is 67239620807. The next prime is 67239620849. The reversal of 67239620845 is 54802693276.

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 15929216521 + 51310404324 = 126211^2 + 226518^2 .

It is a cyclic number.

It is not a de Polignac number, because 67239620845 - 2⁹ = 67239620333 is a prime.

It is a super-2 number, since 2×67239620845² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67239620792 and 67239620801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67239620849) 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, 6723962080 + ... + 6723962089.

It is an arithmetic number, because the mean of its divisors is an integer number (20171886255).

Almost surely, 2^67239620845 is an apocalyptic number.

It is an amenable number.

67239620845 is a deficient number, since it is larger than the sum of its proper divisors (13447924175).

67239620845 is a wasteful number, since it uses less digits than its factorization.

67239620845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13447924174.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 67239620845 in words is "sixty-seven billion, two hundred thirty-nine million, six hundred twenty thousand, eight hundred forty-five".