166722272547 has 4 divisors (see below), whose sum is σ = 222296363400. Its totient is φ = 111148181696.

The previous prime is 166722272539. The next prime is 166722272567. The reversal of 166722272547 is 745272227661.

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 166722272547 - 2³ = 166722272539 is a prime.

It is a super-2 number, since 2×166722272547² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166722272547.

It is not an unprimeable number, because it can be changed into a prime (166722272537) 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, 27787045422 + ... + 27787045427.

It is an arithmetic number, because the mean of its divisors is an integer number (55574090850).

Almost surely, 2^166722272547 is an apocalyptic number.

166722272547 is a deficient number, since it is larger than the sum of its proper divisors (55574090853).

166722272547 is an equidigital number, since it uses as much as digits as its factorization.

166722272547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55574090852.

The product of its digits is 3951360, while the sum is 51.

The spelling of 166722272547 in words is "one hundred sixty-six billion, seven hundred twenty-two million, two hundred seventy-two thousand, five hundred forty-seven".