66737823731 has 4 divisors (see below), whose sum is σ = 66985920000. Its totient is φ = 66489727464.

The previous prime is 66737823671. The next prime is 66737823739. The reversal of 66737823731 is 13732873766.

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

It is a cyclic number.

It is not a de Polignac number, because 66737823731 - 2³⁰ = 65664081907 is a prime.

It is a super-2 number, since 2×66737823731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66737823739) 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 3 ways as a sum of consecutive naturals, for example, 124047731 + ... + 124048268.

It is an arithmetic number, because the mean of its divisors is an integer number (16746480000).

Almost surely, 2^66737823731 is an apocalyptic number.

66737823731 is a deficient number, since it is larger than the sum of its proper divisors (248096269).

66737823731 is a wasteful number, since it uses less digits than its factorization.

66737823731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248096268.

The product of its digits is 5334336, while the sum is 53.

The spelling of 66737823731 in words is "sixty-six billion, seven hundred thirty-seven million, eight hundred twenty-three thousand, seven hundred thirty-one".