77861540107 has 4 divisors (see below), whose sum is σ = 83850889360. Its totient is φ = 71872190856.

The previous prime is 77861540093. The next prime is 77861540123. The reversal of 77861540107 is 70104516877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70104516877 = 1699 ⋅41262223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77861540107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77861540807) 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, 2994674607 + ... + 2994674632.

It is an arithmetic number, because the mean of its divisors is an integer number (20962722340).

Almost surely, 2^77861540107 is an apocalyptic number.

77861540107 is a deficient number, since it is larger than the sum of its proper divisors (5989349253).

77861540107 is a wasteful number, since it uses less digits than its factorization.

77861540107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989349252.

The product of its (nonzero) digits is 329280, while the sum is 46.

The spelling of 77861540107 in words is "seventy-seven billion, eight hundred sixty-one million, five hundred forty thousand, one hundred seven".