66026654377 has 4 divisors (see below), whose sum is σ = 66031628740. Its totient is φ = 66021680016.

The previous prime is 66026654371. The next prime is 66026654417. The reversal of 66026654377 is 77345662066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77345662066 = 2 ⋅38672831033.

It can be written as a sum of positive squares in 2 ways, for example, as 23402574441 + 42624079936 = 152979^2 + 206456^2 .

It is a cyclic number.

It is not a de Polignac number, because 66026654377 - 2²³ = 66018265769 is a prime.

It is a super-3 number, since 3×66026654377³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66026654371) 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, 2467218 + ... + 2493835.

It is an arithmetic number, because the mean of its divisors is an integer number (16507907185).

Almost surely, 2^66026654377 is an apocalyptic number.

It is an amenable number.

66026654377 is a deficient number, since it is larger than the sum of its proper divisors (4974363).

66026654377 is a wasteful number, since it uses less digits than its factorization.

66026654377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4974362.

The product of its (nonzero) digits is 7620480, while the sum is 52.

The spelling of 66026654377 in words is "sixty-six billion, twenty-six million, six hundred fifty-four thousand, three hundred seventy-seven".