77666671 has 4 divisors (see below), whose sum is σ = 78730672. Its totient is φ = 76602672.

The previous prime is 77666657. The next prime is 77666681. The reversal of 77666671 is 17666677.

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

It is a cyclic number.

It is not a de Polignac number, because 77666671 - 2⁷ = 77666543 is a prime.

It is a super-2 number, since 2×77666671² = 12064223568444482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77666621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531891 + ... + 532036.

It is an arithmetic number, because the mean of its divisors is an integer number (19682668).

Almost surely, 2^77666671 is an apocalyptic number.

77666671 is a deficient number, since it is larger than the sum of its proper divisors (1064001).

77666671 is a wasteful number, since it uses less digits than its factorization.

77666671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064000.

The product of its digits is 444528, while the sum is 46.

The square root of 77666671 is about 8812.8696234541. The cubic root of 77666671 is about 426.6563661928.

The spelling of 77666671 in words is "seventy-seven million, six hundred sixty-six thousand, six hundred seventy-one".