66456239297 has 4 divisors (see below), whose sum is σ = 75949987776. Its totient is φ = 56962490820.

The previous prime is 66456239287. The next prime is 66456239309. The reversal of 66456239297 is 79293265466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66456239297 - 2⁸ = 66456239041 is a prime.

It is a super-3 number, since 3×66456239297³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66456239237) 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, 4746874229 + ... + 4746874242.

It is an arithmetic number, because the mean of its divisors is an integer number (18987496944).

Almost surely, 2^66456239297 is an apocalyptic number.

It is an amenable number.

66456239297 is a deficient number, since it is larger than the sum of its proper divisors (9493748479).

66456239297 is an equidigital number, since it uses as much as digits as its factorization.

66456239297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493748478.

The product of its digits is 29393280, while the sum is 59.

The spelling of 66456239297 in words is "sixty-six billion, four hundred fifty-six million, two hundred thirty-nine thousand, two hundred ninety-seven".