2166111152077 has 4 divisors (see below), whose sum is σ = 2166184058400. Its totient is φ = 2166038245756.

The previous prime is 2166111152069. The next prime is 2166111152123. The reversal of 2166111152077 is 7702511116612.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2166111152077 - 2³ = 2166111152069 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 (2166111152027) 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, 36408577 + ... + 36468022.

It is an arithmetic number, because the mean of its divisors is an integer number (541546014600).

Almost surely, 2^{2166111152077} is an apocalyptic number.

It is an amenable number.

2166111152077 is a deficient number, since it is larger than the sum of its proper divisors (72906323).

2166111152077 is an equidigital number, since it uses as much as digits as its factorization.

2166111152077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72906322.

The product of its (nonzero) digits is 35280, while the sum is 40.

Adding to 2166111152077 its reverse (7702511116612), we get a palindrome (9868622268689).

The spelling of 2166111152077 in words is "two trillion, one hundred sixty-six billion, one hundred eleven million, one hundred fifty-two thousand, seventy-seven".