5212166115661 has 4 divisors (see below), whose sum is σ = 5339292118524. Its totient is φ = 5085040112800.

The previous prime is 5212166115641. The next prime is 5212166115671. The reversal of 5212166115661 is 1665116612125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 672390160036 + 4539775955625 = 819994^2 + 2130675^2 .

It is a cyclic number.

It is not a de Polignac number, because 5212166115661 - 2¹⁷ = 5212165984589 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 (5212166115641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63563001370 + ... + 63563001451.

It is an arithmetic number, because the mean of its divisors is an integer number (1334823029631).

Almost surely, 2^{5212166115661} is an apocalyptic number.

It is an amenable number.

5212166115661 is a deficient number, since it is larger than the sum of its proper divisors (127126002863).

5212166115661 is a wasteful number, since it uses less digits than its factorization.

5212166115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127126002862.

The product of its digits is 129600, while the sum is 43.

The spelling of 5212166115661 in words is "five trillion, two hundred twelve billion, one hundred sixty-six million, one hundred fifteen thousand, six hundred sixty-one".