66276401 has 2 divisors, whose sum is σ = 66276402. Its totient is φ = 66276400.

The previous prime is 66276359. The next prime is 66276443. The reversal of 66276401 is 10467266.

It is a balanced prime because it is at equal distance from previous prime (66276359) and next prime (66276443).

It can be written as a sum of positive squares in only one way, i.e., 58125376 + 8151025 = 7624^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 66276401 - 2¹⁸ = 66014257 is a prime.

It is a super-2 number, since 2×66276401² = 8785122659025602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66276491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33138200 + 33138201.

It is an arithmetic number, because the mean of its divisors is an integer number (33138201).

Almost surely, 2^66276401 is an apocalyptic number.

It is an amenable number.

66276401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66276401 is an equidigital number, since it uses as much as digits as its factorization.

66276401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 66276401 is about 8141.0319370458. The cubic root of 66276401 is about 404.6873591856.

The spelling of 66276401 in words is "sixty-six million, two hundred seventy-six thousand, four hundred one".