166618154310253 has 4 divisors (see below), whose sum is σ = 166618853459100. Its totient is φ = 166617455161408.

The previous prime is 166618154310227. The next prime is 166618154310271. The reversal of 166618154310253 is 352013451816661.

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 69789366124009 + 96828788186244 = 8354003^2 + 9840162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166618154310253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166618154310253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166618154313253) 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, 349216828 + ... + 349693621.

It is an arithmetic number, because the mean of its divisors is an integer number (41654713364775).

Almost surely, 2^{166618154310253} is an apocalyptic number.

It is an amenable number.

166618154310253 is a deficient number, since it is larger than the sum of its proper divisors (699148847).

166618154310253 is an equidigital number, since it uses as much as digits as its factorization.

166618154310253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699148846.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 166618154310253 in words is "one hundred sixty-six trillion, six hundred eighteen billion, one hundred fifty-four million, three hundred ten thousand, two hundred fifty-three".