66701215477 has 16 divisors (see below), whose sum is σ = 74339581680. Its totient is φ = 59422809600.

The previous prime is 66701215439. The next prime is 66701215499. The reversal of 66701215477 is 77451210766.

It can be written as a sum of positive squares in 8 ways, for example, as 21092914756 + 45608300721 = 145234^2 + 213561^2 .

It is not a de Polignac number, because 66701215477 - 2¹¹ = 66701213429 is a prime.

It is a super-2 number, since 2×66701215477² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66701215417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915327 + ... + 985507.

It is an arithmetic number, because the mean of its divisors is an integer number (4646223855).

Almost surely, 2^66701215477 is an apocalyptic number.

It is an amenable number.

66701215477 is a deficient number, since it is larger than the sum of its proper divisors (7638366203).

66701215477 is a wasteful number, since it uses less digits than its factorization.

66701215477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72744.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 66701215477 in words is "sixty-six billion, seven hundred one million, two hundred fifteen thousand, four hundred seventy-seven".