166497639 has 24 divisors (see below), whose sum is σ = 281720448. Its totient is φ = 86491440.

The previous prime is 166497637. The next prime is 166497649. The reversal of 166497639 is 936794661.

It is not a de Polignac number, because 166497639 - 2¹ = 166497637 is a prime.

It is a super-4 number, since 4×166497639⁴ (a number of 34 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166497591 and 166497600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166497631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49867 + ... + 53100.

It is an arithmetic number, because the mean of its divisors is an integer number (11738352).

Almost surely, 2^166497639 is an apocalyptic number.

166497639 is a deficient number, since it is larger than the sum of its proper divisors (115222809).

166497639 is a wasteful number, since it uses less digits than its factorization.

166497639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102995 (or 102988 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 51.

The square root of 166497639 is about 12903.3964133479. The cubic root of 166497639 is about 550.1351062027.

The spelling of 166497639 in words is "one hundred sixty-six million, four hundred ninety-seven thousand, six hundred thirty-nine".