66990183121 has 4 divisors (see below), whose sum is σ = 66991381744. Its totient is φ = 66988984500.

The previous prime is 66990183101. The next prime is 66990183133. The reversal of 66990183121 is 12138109966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12138109966 = 2 ⋅6069054983.

It is a cyclic number.

It is not a de Polignac number, because 66990183121 - 2⁵ = 66990183089 is a prime.

It is a super-2 number, since 2×66990183121² (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 (66990183101) 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 3 ways as a sum of consecutive naturals, for example, 511155 + ... + 628696.

It is an arithmetic number, because the mean of its divisors is an integer number (16747845436).

Almost surely, 2^66990183121 is an apocalyptic number.

It is an amenable number.

66990183121 is a deficient number, since it is larger than the sum of its proper divisors (1198623).

66990183121 is a wasteful number, since it uses less digits than its factorization.

66990183121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198622.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 66990183121 in words is "sixty-six billion, nine hundred ninety million, one hundred eighty-three thousand, one hundred twenty-one".