66259491744 has 24 divisors (see below), whose sum is σ = 173931166080. Its totient is φ = 22086497216.

The previous prime is 66259491689. The next prime is 66259491773. The reversal of 66259491744 is 44719495266.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345101424 + ... + 345101615.

It is an arithmetic number, because the mean of its divisors is an integer number (7247131920).

Almost surely, 2^66259491744 is an apocalyptic number.

It is an amenable number.

66259491744 is an abundant number, since it is smaller than the sum of its proper divisors (107671674336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66259491744 is a wasteful number, since it uses less digits than its factorization.

66259491744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690203052 (or 690203044 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 57.

The spelling of 66259491744 in words is "sixty-six billion, two hundred fifty-nine million, four hundred ninety-one thousand, seven hundred forty-four".