66151031 has 2 divisors, whose sum is σ = 66151032. Its totient is φ = 66151030.

The previous prime is 66150947. The next prime is 66151037. The reversal of 66151031 is 13015166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66151031 is a prime.

It is a super-2 number, since 2×66151031² = 8751917804725922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66150988 and 66151006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66151037) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33075515 + 33075516.

It is an arithmetic number, because the mean of its divisors is an integer number (33075516).

Almost surely, 2^66151031 is an apocalyptic number.

66151031 is a deficient number, since it is larger than the sum of its proper divisors (1).

66151031 is an equidigital number, since it uses as much as digits as its factorization.

66151031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 66151031 is about 8133.3284084685. The cubic root of 66151031 is about 404.4320260754.

Adding to 66151031 its reverse (13015166), we get a palindrome (79166197).

The spelling of 66151031 in words is "sixty-six million, one hundred fifty-one thousand, thirty-one".