77910121111 has 8 divisors (see below), whose sum is σ = 78871637520. Its totient is φ = 76952926848.

The previous prime is 77910121099. The next prime is 77910121123. The reversal of 77910121111 is 11112101977.

It is an interprime number because it is at equal distance from previous prime (77910121099) and next prime (77910121123).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77910121111 - 2⁷ = 77910120983 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 (77910121141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044256 + ... + 1116373.

It is an arithmetic number, because the mean of its divisors is an integer number (9858954690).

Almost surely, 2^77910121111 is an apocalyptic number.

77910121111 is a deficient number, since it is larger than the sum of its proper divisors (961516409).

77910121111 is a wasteful number, since it uses less digits than its factorization.

77910121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161073.

The product of its (nonzero) digits is 882, while the sum is 31.

The spelling of 77910121111 in words is "seventy-seven billion, nine hundred ten million, one hundred twenty-one thousand, one hundred eleven".