213668840677 has 4 divisors (see below), whose sum is σ = 213825146976. Its totient is φ = 213512534380.

The previous prime is 213668840669. The next prime is 213668840681. The reversal of 213668840677 is 776048866312.

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 213668840677 - 2³ = 213668840669 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 (213668843677) 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, 78151099 + ... + 78153832.

It is an arithmetic number, because the mean of its divisors is an integer number (53456286744).

Almost surely, 2^213668840677 is an apocalyptic number.

It is an amenable number.

213668840677 is a deficient number, since it is larger than the sum of its proper divisors (156306299).

213668840677 is a wasteful number, since it uses less digits than its factorization.

213668840677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156306298.

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 213668840677 in words is "two hundred thirteen billion, six hundred sixty-eight million, eight hundred forty thousand, six hundred seventy-seven".