66712151121 has 32 divisors (see below), whose sum is σ = 111207168000. Its totient is φ = 34559086080.

The previous prime is 66712151101. The next prime is 66712151123. The reversal of 66712151121 is 12115121766.

It is not a de Polignac number, because 66712151121 - 2⁶ = 66712151057 is a prime.

It is a super-2 number, since 2×66712151121² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66712151123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319296 + ... + 485153.

It is an arithmetic number, because the mean of its divisors is an integer number (3475224000).

Almost surely, 2^66712151121 is an apocalyptic number.

It is an amenable number.

66712151121 is a deficient number, since it is larger than the sum of its proper divisors (44495016879).

66712151121 is a wasteful number, since it uses less digits than its factorization.

66712151121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804829.

The product of its digits is 5040, while the sum is 33.

Adding to 66712151121 its reverse (12115121766), we get a palindrome (78827272887).

The spelling of 66712151121 in words is "sixty-six billion, seven hundred twelve million, one hundred fifty-one thousand, one hundred twenty-one".