166237607623 has 4 divisors (see below), whose sum is σ = 167708737008. Its totient is φ = 164766478240.

The previous prime is 166237607597. The next prime is 166237607681. The reversal of 166237607623 is 326706732661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326706732661 = 1217 ⋅268452533.

It is a cyclic number.

It is not a de Polignac number, because 166237607623 - 2⁹ = 166237607111 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 (166237605623) 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, 735564523 + ... + 735564748.

It is an arithmetic number, because the mean of its divisors is an integer number (41927184252).

Almost surely, 2^166237607623 is an apocalyptic number.

166237607623 is a deficient number, since it is larger than the sum of its proper divisors (1471129385).

166237607623 is a wasteful number, since it uses less digits than its factorization.

166237607623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471129384.

The product of its (nonzero) digits is 2286144, while the sum is 49.

The spelling of 166237607623 in words is "one hundred sixty-six billion, two hundred thirty-seven million, six hundred seven thousand, six hundred twenty-three".