66216136542 has 32 divisors (see below), whose sum is σ = 139438869120. Its totient is φ = 20904887520.

The previous prime is 66216136489. The next prime is 66216136577. The reversal of 66216136542 is 24563161266.

It is a junction number, because it is equal to n+sod(n) for n = 66216136494 and 66216136503.

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, 373192 + ... + 521252.

It is an arithmetic number, because the mean of its divisors is an integer number (4357464660).

Almost surely, 2^66216136542 is an apocalyptic number.

66216136542 is an abundant number, since it is smaller than the sum of its proper divisors (73222732578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66216136542 is a wasteful number, since it uses less digits than its factorization.

66216136542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152008.

The product of its digits is 311040, while the sum is 42.

The spelling of 66216136542 in words is "sixty-six billion, two hundred sixteen million, one hundred thirty-six thousand, five hundred forty-two".