166759151138 has 4 divisors (see below), whose sum is σ = 250138726710. Its totient is φ = 83379575568.

The previous prime is 166759151131. The next prime is 166759151201. The reversal of 166759151138 is 831151957661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831151957661 = 3823 ⋅217408307.

It can be written as a sum of positive squares in only one way, i.e., 162951890929 + 3807260209 = 403673^2 + 61703^2 .

It is a super-2 number, since 2×166759151138² (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 166759151138.

It is not an unprimeable number, because it can be changed into a prime (166759151131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41689787783 + ... + 41689787786.

Almost surely, 2^166759151138 is an apocalyptic number.

166759151138 is a deficient number, since it is larger than the sum of its proper divisors (83379575572).

166759151138 is an equidigital number, since it uses as much as digits as its factorization.

166759151138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83379575571.

The product of its digits is 1360800, while the sum is 53.

The spelling of 166759151138 in words is "one hundred sixty-six billion, seven hundred fifty-nine million, one hundred fifty-one thousand, one hundred thirty-eight".