66172525558 has 8 divisors (see below), whose sum is σ = 101679734520. Its totient is φ = 32279280720.

The previous prime is 66172525553. The next prime is 66172525579. The reversal of 66172525558 is 85552527166.

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

It is a super-3 number, since 3×66172525558³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172525553) 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, 403490928 + ... + 403491091.

It is an arithmetic number, because the mean of its divisors is an integer number (12709966815).

Almost surely, 2^66172525558 is an apocalyptic number.

66172525558 is a deficient number, since it is larger than the sum of its proper divisors (35507208962).

66172525558 is a wasteful number, since it uses less digits than its factorization.

66172525558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806982062.

The product of its digits is 5040000, while the sum is 52.

The spelling of 66172525558 in words is "sixty-six billion, one hundred seventy-two million, five hundred twenty-five thousand, five hundred fifty-eight".