66148052491 has 2 divisors, whose sum is σ = 66148052492. Its totient is φ = 66148052490.

The previous prime is 66148052449. The next prime is 66148052533. The reversal of 66148052491 is 19425084166.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (66148052449) and next prime (66148052533).

It is a cyclic number.

It is not a de Polignac number, because 66148052491 - 2⁹ = 66148051979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66148052431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33074026245 + 33074026246.

It is an arithmetic number, because the mean of its divisors is an integer number (33074026246).

Almost surely, 2^66148052491 is an apocalyptic number.

66148052491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66148052491 is an equidigital number, since it uses as much as digits as its factorization.

66148052491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 66148052491 in words is "sixty-six billion, one hundred forty-eight million, fifty-two thousand, four hundred ninety-one".