66007349089921 has 4 divisors (see below), whose sum is σ = 66007981491012. Its totient is φ = 66006716688832.

The previous prime is 66007349089909. The next prime is 66007349089933. The reversal of 66007349089921 is 12998094370066.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66007349089909) and next prime (66007349089933).

It can be written as a sum of positive squares in 2 ways, for example, as 51135528129921 + 14871820960000 = 7150911^2 + 3856400^2 .

It is a cyclic number.

It is not a de Polignac number, because 66007349089921 - 2⁷ = 66007349089793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66007349089421) 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, 316043956 + ... + 316252741.

It is an arithmetic number, because the mean of its divisors is an integer number (16501995372753).

Almost surely, 2^{66007349089921} is an apocalyptic number.

It is an amenable number.

66007349089921 is a deficient number, since it is larger than the sum of its proper divisors (632401091).

66007349089921 is a wasteful number, since it uses less digits than its factorization.

66007349089921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632401090.

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 66007349089921 in words is "sixty-six trillion, seven billion, three hundred forty-nine million, eighty-nine thousand, nine hundred twenty-one".