66457751 has 2 divisors, whose sum is σ = 66457752. Its totient is φ = 66457750.

The previous prime is 66457693. The next prime is 66457757. The reversal of 66457751 is 15775466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66457751 - 2¹⁴ = 66441367 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66457699 and 66457708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66457757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33228875 + 33228876.

It is an arithmetic number, because the mean of its divisors is an integer number (33228876).

Almost surely, 2^66457751 is an apocalyptic number.

66457751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66457751 is an equidigital number, since it uses as much as digits as its factorization.

66457751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 41.

The square root of 66457751 is about 8152.1623511802. The cubic root of 66457751 is about 405.0561340676.

The spelling of 66457751 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred fifty-one".