66273751 has 2 divisors, whose sum is σ = 66273752. Its totient is φ = 66273750.

The previous prime is 66273737. The next prime is 66273763. The reversal of 66273751 is 15737266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66273751 - 2⁵ = 66273719 is a prime.

It is a super-2 number, since 2×66273751² = 8784420143220002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66273751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66273791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33136875 + 33136876.

It is an arithmetic number, because the mean of its divisors is an integer number (33136876).

Almost surely, 2^66273751 is an apocalyptic number.

66273751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66273751 is an equidigital number, since it uses as much as digits as its factorization.

66273751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 66273751 is about 8140.8691796392. The cubic root of 66273751 is about 404.6819654317.

The spelling of 66273751 in words is "sixty-six million, two hundred seventy-three thousand, seven hundred fifty-one".