213738016777 has 4 divisors (see below), whose sum is σ = 214550709120. Its totient is φ = 212925324436.

The previous prime is 213738016771. The next prime is 213738016783. The reversal of 213738016777 is 777610837312.

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 an interprime number because it is at equal distance from previous prime (213738016771) and next prime (213738016783).

It is a cyclic number.

It is not a de Polignac number, because 213738016777 - 2³ = 213738016769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213738016771) 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, 406345777 + ... + 406346302.

It is an arithmetic number, because the mean of its divisors is an integer number (53637677280).

Almost surely, 2^213738016777 is an apocalyptic number.

It is an amenable number.

213738016777 is a deficient number, since it is larger than the sum of its proper divisors (812692343).

213738016777 is an equidigital number, since it uses as much as digits as its factorization.

213738016777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812692342.

The product of its (nonzero) digits is 2074464, while the sum is 52.

The spelling of 213738016777 in words is "two hundred thirteen billion, seven hundred thirty-eight million, sixteen thousand, seven hundred seventy-seven".