66135615838 has 8 divisors (see below), whose sum is σ = 99275998032. Its totient is φ = 33043616496.

The previous prime is 66135615829. The next prime is 66135615859. The reversal of 66135615838 is 83851653166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 12092295 + ... + 12097762.

It is an arithmetic number, because the mean of its divisors is an integer number (12409499754).

Almost surely, 2^66135615838 is an apocalyptic number.

66135615838 is a deficient number, since it is larger than the sum of its proper divisors (33140382194).

66135615838 is a wasteful number, since it uses less digits than its factorization.

66135615838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24191426.

The product of its digits is 3110400, while the sum is 52.

The spelling of 66135615838 in words is "sixty-six billion, one hundred thirty-five million, six hundred fifteen thousand, eight hundred thirty-eight".