66624325739 has 16 divisors (see below), whose sum is σ = 67851235008. Its totient is φ = 65410716672.

The previous prime is 66624325667. The next prime is 66624325741. The reversal of 66624325739 is 93752342666.

66624325739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66624325739 - 2¹⁶ = 66624260203 is a prime.

It is a super-2 number, since 2×66624325739² (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 (66624325039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7534829 + ... + 7543665.

It is an arithmetic number, because the mean of its divisors is an integer number (4240702188).

Almost surely, 2^66624325739 is an apocalyptic number.

66624325739 is a deficient number, since it is larger than the sum of its proper divisors (1226909269).

66624325739 is a wasteful number, since it uses less digits than its factorization.

66624325739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9574.

The product of its digits is 9797760, while the sum is 53.

The spelling of 66624325739 in words is "sixty-six billion, six hundred twenty-four million, three hundred twenty-five thousand, seven hundred thirty-nine".