166347438407 has 4 divisors (see below), whose sum is σ = 169074445656. Its totient is φ = 163620431160.

The previous prime is 166347438377. The next prime is 166347438421. The reversal of 166347438407 is 704834743661.

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: 704834743661 = 457 ⋅1542307973.

It is a cyclic number.

It is not a de Polignac number, because 166347438407 - 2⁶ = 166347438343 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 (166347438437) 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, 1363503533 + ... + 1363503654.

It is an arithmetic number, because the mean of its divisors is an integer number (42268611414).

Almost surely, 2^166347438407 is an apocalyptic number.

166347438407 is a deficient number, since it is larger than the sum of its proper divisors (2727007249).

166347438407 is an equidigital number, since it uses as much as digits as its factorization.

166347438407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727007248.

The product of its (nonzero) digits is 8128512, while the sum is 53.

The spelling of 166347438407 in words is "one hundred sixty-six billion, three hundred forty-seven million, four hundred thirty-eight thousand, four hundred seven".