60666578138 has 4 divisors (see below), whose sum is σ = 90999867210. Its totient is φ = 30333289068.

The previous prime is 60666578111. The next prime is 60666578171. The reversal of 60666578138 is 83187566606.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42665794249 + 18000783889 = 206557^2 + 134167^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15166644533 + ... + 15166644536.

Almost surely, 2^60666578138 is an apocalyptic number.

60666578138 is a deficient number, since it is larger than the sum of its proper divisors (30333289072).

60666578138 is a wasteful number, since it uses less digits than its factorization.

60666578138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30333289071.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 60666578138 in words is "sixty billion, six hundred sixty-six million, five hundred seventy-eight thousand, one hundred thirty-eight".