66542201497 has 2 divisors, whose sum is σ = 66542201498. Its totient is φ = 66542201496.

The previous prime is 66542201461. The next prime is 66542201501. The reversal of 66542201497 is 79410224566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41709484441 + 24832717056 = 204229^2 + 157584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66542201497 is a prime.

It is not a weakly prime, because it can be changed into another prime (66542201897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271100748 + 33271100749.

It is an arithmetic number, because the mean of its divisors is an integer number (33271100749).

Almost surely, 2^66542201497 is an apocalyptic number.

It is an amenable number.

66542201497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66542201497 is an equidigital number, since it uses as much as digits as its factorization.

66542201497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

It can be divided in two parts, 6654 and 2201497, that added together give a triangular number (2208151 = T₂₁₀₁).

The spelling of 66542201497 in words is "sixty-six billion, five hundred forty-two million, two hundred one thousand, four hundred ninety-seven".