77066777 has 4 divisors (see below), whose sum is σ = 77108580. Its totient is φ = 77024976.

The previous prime is 77066771. The next prime is 77066783. The reversal of 77066777 is 77766077.

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

It is an interprime number because it is at equal distance from previous prime (77066771) and next prime (77066783).

It can be written as a sum of positive squares in 2 ways, for example, as 48219136 + 28847641 = 6944^2 + 5371^2 .

It is a cyclic number.

It is not a de Polignac number, because 77066777 - 2⁴ = 77066761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77066771) 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, 18002 + ... + 21867.

It is an arithmetic number, because the mean of its divisors is an integer number (19277145).

Almost surely, 2^77066777 is an apocalyptic number.

It is an amenable number.

77066777 is a deficient number, since it is larger than the sum of its proper divisors (41803).

77066777 is a wasteful number, since it uses less digits than its factorization.

77066777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41802.

The product of its (nonzero) digits is 605052, while the sum is 47.

The square root of 77066777 is about 8778.7685355066. The cubic root of 77066777 is about 425.5550340005. Note that the first 3 decimals are identical.

The spelling of 77066777 in words is "seventy-seven million, sixty-six thousand, seven hundred seventy-seven".