66077156621566 has 4 divisors (see below), whose sum is σ = 99115734932352. Its totient is φ = 33038578310782.

The previous prime is 66077156621563. The next prime is 66077156621587. The reversal of 66077156621566 is 66512665177066.

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

It is a junction number, because it is equal to n+sod(n) for n = 66077156621498 and 66077156621507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66077156621563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16519289155390 + ... + 16519289155393.

It is an arithmetic number, because the mean of its divisors is an integer number (24778933733088).

Almost surely, 2^{66077156621566} is an apocalyptic number.

66077156621566 is a deficient number, since it is larger than the sum of its proper divisors (33038578310786).

66077156621566 is a wasteful number, since it uses less digits than its factorization.

66077156621566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33038578310785.

The product of its (nonzero) digits is 114307200, while the sum is 64.

The spelling of 66077156621566 in words is "sixty-six trillion, seventy-seven billion, one hundred fifty-six million, six hundred twenty-one thousand, five hundred sixty-six".