77866665542111 has 4 divisors (see below), whose sum is σ = 77867773703424. Its totient is φ = 77865557380800.

The previous prime is 77866665542027. The next prime is 77866665542117. The reversal of 77866665542111 is 11124556666877.

It is a happy number.

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 77866665542111 - 2¹⁰ = 77866665541087 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 (77866665542117) 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, 553975250 + ... + 554115791.

It is an arithmetic number, because the mean of its divisors is an integer number (19466943425856).

Almost surely, 2^{77866665542111} is an apocalyptic number.

77866665542111 is a deficient number, since it is larger than the sum of its proper divisors (1108161313).

77866665542111 is a wasteful number, since it uses less digits than its factorization.

77866665542111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108161312.

The product of its digits is 101606400, while the sum is 65.

The spelling of 77866665542111 in words is "seventy-seven trillion, eight hundred sixty-six billion, six hundred sixty-five million, five hundred forty-two thousand, one hundred eleven".