66437417491 has 2 divisors, whose sum is σ = 66437417492. Its totient is φ = 66437417490.

The previous prime is 66437417467. The next prime is 66437417507. The reversal of 66437417491 is 19471473466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66437417491 - 2⁹ = 66437416979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66437427491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33218708745 + 33218708746.

It is an arithmetic number, because the mean of its divisors is an integer number (33218708746).

Almost surely, 2^66437417491 is an apocalyptic number.

66437417491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66437417491 is an equidigital number, since it uses as much as digits as its factorization.

66437417491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 52.

The spelling of 66437417491 in words is "sixty-six billion, four hundred thirty-seven million, four hundred seventeen thousand, four hundred ninety-one".