12172155542 has 8 divisors (see below), whose sum is σ = 19052069616. Its totient is φ = 5821465672.

The previous prime is 12172155467. The next prime is 12172155547. The reversal of 12172155542 is 24555127121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12172155542² (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 (12172155547) 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, 132305993 + ... + 132306084.

It is an arithmetic number, because the mean of its divisors is an integer number (2381508702).

Almost surely, 2^12172155542 is an apocalyptic number.

12172155542 is a deficient number, since it is larger than the sum of its proper divisors (6879914074).

12172155542 is a wasteful number, since it uses less digits than its factorization.

12172155542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264612102.

The product of its digits is 28000, while the sum is 35.

The spelling of 12172155542 in words is "twelve billion, one hundred seventy-two million, one hundred fifty-five thousand, five hundred forty-two".