12172545406 has 12 divisors (see below), whose sum is σ = 21239849808. Its totient is φ = 5216805132.

The previous prime is 12172545401. The next prime is 12172545419. The reversal of 12172545406 is 60454527121.

It is a super-2 number, since 2×12172545406² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172545401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62104726 + ... + 62104921.

It is an arithmetic number, because the mean of its divisors is an integer number (1769987484).

Almost surely, 2^12172545406 is an apocalyptic number.

12172545406 is a deficient number, since it is larger than the sum of its proper divisors (9067304402).

12172545406 is a wasteful number, since it uses less digits than its factorization.

12172545406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124209663 (or 124209656 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 12172545406 in words is "twelve billion, one hundred seventy-two million, five hundred forty-five thousand, four hundred six".