213720624577 has 4 divisors (see below), whose sum is σ = 214552222596. Its totient is φ = 212889026560.

The previous prime is 213720624539. The next prime is 213720624581. The reversal of 213720624577 is 775426027312.

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 203559782976 + 10160841601 = 451176^2 + 100801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213720624577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213720624877) 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, 415798624 + ... + 415799137.

It is an arithmetic number, because the mean of its divisors is an integer number (53638055649).

Almost surely, 2^213720624577 is an apocalyptic number.

It is an amenable number.

213720624577 is a deficient number, since it is larger than the sum of its proper divisors (831598019).

213720624577 is an equidigital number, since it uses as much as digits as its factorization.

213720624577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831598018.

The product of its (nonzero) digits is 987840, while the sum is 46.

The spelling of 213720624577 in words is "two hundred thirteen billion, seven hundred twenty million, six hundred twenty-four thousand, five hundred seventy-seven".