66061551156 has 12 divisors (see below), whose sum is σ = 154143619392. Its totient is φ = 22020517048.

The previous prime is 66061551137. The next prime is 66061551209. The reversal of 66061551156 is 65115516066.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66061551156² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2752564620 + ... + 2752564643.

It is an arithmetic number, because the mean of its divisors is an integer number (12845301616).

Almost surely, 2^66061551156 is an apocalyptic number.

It is an amenable number.

66061551156 is an abundant number, since it is smaller than the sum of its proper divisors (88082068236).

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

66061551156 is a wasteful number, since it uses less digits than its factorization.

66061551156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505129270 (or 5505129268 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 66061551156 in words is "sixty-six billion, sixty-one million, five hundred fifty-one thousand, one hundred fifty-six".