66774250651 has 2 divisors, whose sum is σ = 66774250652. Its totient is φ = 66774250650.

The previous prime is 66774250633. The next prime is 66774250657. The reversal of 66774250651 is 15605247766.

66774250651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66774250651 is a prime.

It is a super-3 number, since 3×66774250651³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66774250595 and 66774250604.

It is not a weakly prime, because it can be changed into another prime (66774250657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387125325 + 33387125326.

It is an arithmetic number, because the mean of its divisors is an integer number (33387125326).

Almost surely, 2^66774250651 is an apocalyptic number.

66774250651 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774250651 is an equidigital number, since it uses as much as digits as its factorization.

66774250651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 66774250651 in words is "sixty-six billion, seven hundred seventy-four million, two hundred fifty thousand, six hundred fifty-one".