66456698437 has 4 divisors (see below), whose sum is σ = 66465768460. Its totient is φ = 66447628416.

The previous prime is 66456698423. The next prime is 66456698467. The reversal of 66456698437 is 73489665466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4498519041 + 61958179396 = 67071^2 + 248914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66456698437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66456698417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4524012 + ... + 4538677.

It is an arithmetic number, because the mean of its divisors is an integer number (16616442115).

Almost surely, 2^66456698437 is an apocalyptic number.

It is an amenable number.

66456698437 is a deficient number, since it is larger than the sum of its proper divisors (9070023).

66456698437 is an equidigital number, since it uses as much as digits as its factorization.

66456698437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9070022.

The product of its digits is 156764160, while the sum is 64.

The spelling of 66456698437 in words is "sixty-six billion, four hundred fifty-six million, six hundred ninety-eight thousand, four hundred thirty-seven".