66537736798 has 32 divisors (see below), whose sum is σ = 107744484960. Its totient is φ = 30635418240.

The previous prime is 66537736787. The next prime is 66537736829. The reversal of 66537736798 is 89763773566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31076808 + ... + 31078948.

It is an arithmetic number, because the mean of its divisors is an integer number (3367015155).

Almost surely, 2^66537736798 is an apocalyptic number.

66537736798 is a deficient number, since it is larger than the sum of its proper divisors (41206748162).

66537736798 is a wasteful number, since it uses less digits than its factorization.

66537736798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492.

The product of its digits is 240045120, while the sum is 67.

The spelling of 66537736798 in words is "sixty-six billion, five hundred thirty-seven million, seven hundred thirty-six thousand, seven hundred ninety-eight".