77425566566 has 4 divisors (see below), whose sum is σ = 116138349852. Its totient is φ = 38712783282.

The previous prime is 77425566511. The next prime is 77425566593. The reversal of 77425566566 is 66566552477.

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

It is a super-3 number, since 3×77425566566³ (a number of 34 digits) contains 333 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 as a sum of consecutive naturals, namely, 19356391640 + ... + 19356391643.

It is an arithmetic number, because the mean of its divisors is an integer number (29034587463).

Almost surely, 2^77425566566 is an apocalyptic number.

77425566566 is a deficient number, since it is larger than the sum of its proper divisors (38712783286).

77425566566 is a wasteful number, since it uses less digits than its factorization.

77425566566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38712783285.

The product of its digits is 63504000, while the sum is 59.

The spelling of 77425566566 in words is "seventy-seven billion, four hundred twenty-five million, five hundred sixty-six thousand, five hundred sixty-six".