66022006261 has 4 divisors (see below), whose sum is σ = 66260353132. Its totient is φ = 65783659392.

The previous prime is 66022006217. The next prime is 66022006273. The reversal of 66022006261 is 16260022066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16260022066 = 2 ⋅8130011033.

It can be written as a sum of positive squares in 2 ways, for example, as 12926325636 + 53095680625 = 113694^2 + 230425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66022006261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66022006861) 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, 119173020 + ... + 119173573.

It is an arithmetic number, because the mean of its divisors is an integer number (16565088283).

Almost surely, 2^66022006261 is an apocalyptic number.

It is an amenable number.

66022006261 is a deficient number, since it is larger than the sum of its proper divisors (238346871).

66022006261 is a wasteful number, since it uses less digits than its factorization.

66022006261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238346870.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 66022006261 in words is "sixty-six billion, twenty-two million, six thousand, two hundred sixty-one".