66147312155 has 8 divisors (see below), whose sum is σ = 81222746352. Its totient is φ = 51687201888.

The previous prime is 66147312131. The next prime is 66147312163. The reversal of 66147312155 is 55121374166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66147312155 - 2³⁴ = 48967442971 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153830744 + ... + 153831173.

It is an arithmetic number, because the mean of its divisors is an integer number (10152843294).

Almost surely, 2^66147312155 is an apocalyptic number.

66147312155 is a deficient number, since it is larger than the sum of its proper divisors (15075434197).

66147312155 is a wasteful number, since it uses less digits than its factorization.

66147312155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307661965.

The product of its digits is 151200, while the sum is 41.

The spelling of 66147312155 in words is "sixty-six billion, one hundred forty-seven million, three hundred twelve thousand, one hundred fifty-five".