66122957 has 4 divisors (see below), whose sum is σ = 66139260. Its totient is φ = 66106656.

The previous prime is 66122951. The next prime is 66122977. The reversal of 66122957 is 75922166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75922166 = 2 ⋅37961083.

It can be written as a sum of positive squares in 2 ways, for example, as 31147561 + 34975396 = 5581^2 + 5914^2 .

It is a cyclic number.

It is not a de Polignac number, because 66122957 - 2⁸ = 66122701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66122957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66122951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3233 + ... + 11945.

It is an arithmetic number, because the mean of its divisors is an integer number (16534815).

Almost surely, 2^66122957 is an apocalyptic number.

It is an amenable number.

66122957 is a deficient number, since it is larger than the sum of its proper divisors (16303).

66122957 is an equidigital number, since it uses as much as digits as its factorization.

66122957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16302.

The product of its digits is 45360, while the sum is 38.

The square root of 66122957 is about 8131.6023636181. The cubic root of 66122957 is about 404.3748053433.

The spelling of 66122957 in words is "sixty-six million, one hundred twenty-two thousand, nine hundred fifty-seven".