77772566027 has 4 divisors (see below), whose sum is σ = 83755071120. Its totient is φ = 71790060936.

The previous prime is 77772565987. The next prime is 77772566029. The reversal of 77772566027 is 72066527777.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77772566027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77772566029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2991252527 + ... + 2991252552.

It is an arithmetic number, because the mean of its divisors is an integer number (20938767780).

Almost surely, 2^77772566027 is an apocalyptic number.

77772566027 is a deficient number, since it is larger than the sum of its proper divisors (5982505093).

77772566027 is a wasteful number, since it uses less digits than its factorization.

77772566027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5982505092.

The product of its (nonzero) digits is 12101040, while the sum is 56.

The spelling of 77772566027 in words is "seventy-seven billion, seven hundred seventy-two million, five hundred sixty-six thousand, twenty-seven".