77110661 has 4 divisors (see below), whose sum is σ = 77699424. Its totient is φ = 76521900.

The previous prime is 77110639. The next prime is 77110669. The reversal of 77110661 is 16601177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16601177 = 199 ⋅83423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77110661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77110669) 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, 294185 + ... + 294446.

It is an arithmetic number, because the mean of its divisors is an integer number (19424856).

Almost surely, 2^77110661 is an apocalyptic number.

It is an amenable number.

77110661 is a deficient number, since it is larger than the sum of its proper divisors (588763).

77110661 is a wasteful number, since it uses less digits than its factorization.

77110661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588762.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 77110661 is about 8781.2676191994. The cubic root of 77110661 is about 425.6357930264.

The spelling of 77110661 in words is "seventy-seven million, one hundred ten thousand, six hundred sixty-one".