77108661 has 24 divisors (see below), whose sum is σ = 128910080. Its totient is φ = 43501536.

The previous prime is 77108639. The next prime is 77108663. The reversal of 77108661 is 16680177.

It is a happy number.

It is not a de Polignac number, because 77108661 - 2⁶ = 77108597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77108663) 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 23 ways as a sum of consecutive naturals, for example, 2770 + ... + 12723.

Almost surely, 2^77108661 is an apocalyptic number.

It is an amenable number.

77108661 is a deficient number, since it is larger than the sum of its proper divisors (51801419).

77108661 is a wasteful number, since it uses less digits than its factorization.

77108661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15585 (or 15582 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 77108661 is about 8781.1537396859. The cubic root of 77108661 is about 425.6321131248.

The spelling of 77108661 in words is "seventy-seven million, one hundred eight thousand, six hundred sixty-one".