66126425531 has 8 divisors (see below), whose sum is σ = 68273132928. Its totient is φ = 63980568000.

The previous prime is 66126425503. The next prime is 66126425579. The reversal of 66126425531 is 13552462166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66126425531 - 2¹⁸ = 66126163387 is a prime.

It is a super-2 number, since 2×66126425531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66126425831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52400 + ... + 367421.

It is an arithmetic number, because the mean of its divisors is an integer number (8534141616).

Almost surely, 2^66126425531 is an apocalyptic number.

66126425531 is a deficient number, since it is larger than the sum of its proper divisors (2146707397).

66126425531 is a wasteful number, since it uses less digits than its factorization.

66126425531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424933.

The product of its digits is 259200, while the sum is 41.

Adding to 66126425531 its reverse (13552462166), we get a palindrome (79678887697).

The spelling of 66126425531 in words is "sixty-six billion, one hundred twenty-six million, four hundred twenty-five thousand, five hundred thirty-one".