66535558744 has 8 divisors (see below), whose sum is σ = 124754172660. Its totient is φ = 33267779368.

The previous prime is 66535558723. The next prime is 66535558751. The reversal of 66535558744 is 44785553566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4158472414 + ... + 4158472429.

Almost surely, 2^66535558744 is an apocalyptic number.

It is an amenable number.

66535558744 is a deficient number, since it is larger than the sum of its proper divisors (58218613916).

66535558744 is a wasteful number, since it uses less digits than its factorization.

66535558744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8316944849 (or 8316944845 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 58.

The spelling of 66535558744 in words is "sixty-six billion, five hundred thirty-five million, five hundred fifty-eight thousand, seven hundred forty-four".