72161066502167 has 4 divisors (see below), whose sum is σ = 72379075766856. Its totient is φ = 71943057237480.

The previous prime is 72161066502163. The next prime is 72161066502221. The reversal of 72161066502167 is 76120566016127.

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

It is a cyclic number.

It is not a de Polignac number, because 72161066502167 - 2² = 72161066502163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72161066502163) 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, 109004631848 + ... + 109004632509.

It is an arithmetic number, because the mean of its divisors is an integer number (18094768941714).

Almost surely, 2^{72161066502167} is an apocalyptic number.

72161066502167 is a deficient number, since it is larger than the sum of its proper divisors (218009264689).

72161066502167 is a wasteful number, since it uses less digits than its factorization.

72161066502167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218009264688.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 72161066502167 in words is "seventy-two trillion, one hundred sixty-one billion, sixty-six million, five hundred two thousand, one hundred sixty-seven".