66838779148 has 48 divisors (see below), whose sum is σ = 124717824000. Its totient is φ = 31269294144.

The previous prime is 66838779107. The next prime is 66838779197. The reversal of 66838779148 is 84197783866.

It is a happy 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, 11883865 + ... + 11889487.

It is an arithmetic number, because the mean of its divisors is an integer number (2598288000).

Almost surely, 2^66838779148 is an apocalyptic number.

It is an amenable number.

66838779148 is a deficient number, since it is larger than the sum of its proper divisors (57879044852).

66838779148 is a wasteful number, since it uses less digits than its factorization.

66838779148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8446 (or 8444 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 67.

The spelling of 66838779148 in words is "sixty-six billion, eight hundred thirty-eight million, seven hundred seventy-nine thousand, one hundred forty-eight".