166275735407 has 4 divisors (see below), whose sum is σ = 166404532776. Its totient is φ = 166146938040.

The previous prime is 166275735397. The next prime is 166275735419. The reversal of 166275735407 is 704537572661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704537572661 = 13 ⋅54195197897.

It is a cyclic number.

It is not a de Polignac number, because 166275735407 - 2⁴ = 166275735391 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 (166275735427) 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, 64396748 + ... + 64399329.

It is an arithmetic number, because the mean of its divisors is an integer number (41601133194).

Almost surely, 2^166275735407 is an apocalyptic number.

166275735407 is a deficient number, since it is larger than the sum of its proper divisors (128797369).

166275735407 is a wasteful number, since it uses less digits than its factorization.

166275735407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128797368.

The product of its (nonzero) digits is 7408800, while the sum is 53.

The spelling of 166275735407 in words is "one hundred sixty-six billion, two hundred seventy-five million, seven hundred thirty-five thousand, four hundred seven".