166416106165431 has 4 divisors (see below), whose sum is σ = 221888141553912. Its totient is φ = 110944070776952.

The previous prime is 166416106165423. The next prime is 166416106165453. The reversal of 166416106165431 is 134561601614661.

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 166416106165431 - 2³ = 166416106165423 is a prime.

It is a super-2 number, since 2×166416106165431² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166416106165481) 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, 27736017694236 + ... + 27736017694241.

It is an arithmetic number, because the mean of its divisors is an integer number (55472035388478).

Almost surely, 2^{166416106165431} is an apocalyptic number.

166416106165431 is a deficient number, since it is larger than the sum of its proper divisors (55472035388481).

166416106165431 is an equidigital number, since it uses as much as digits as its factorization.

166416106165431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55472035388480.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 166416106165431 in words is "one hundred sixty-six trillion, four hundred sixteen billion, one hundred six million, one hundred sixty-five thousand, four hundred thirty-one".