624561661633213 has 4 divisors (see below), whose sum is σ = 624569769846940. Its totient is φ = 624553553419488.

The previous prime is 624561661633177. The next prime is 624561661633223. The reversal of 624561661633213 is 312336166165426.

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 281649856010329 + 342911805622884 = 16782427^2 + 18517878^2 .

It is a cyclic number.

It is not a de Polignac number, because 624561661633213 - 2²⁵ = 624561628078781 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 (624561661633223) 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, 4053991320 + ... + 4054145377.

It is an arithmetic number, because the mean of its divisors is an integer number (156142442461735).

Almost surely, 2^{624561661633213} is an apocalyptic number.

It is an amenable number.

624561661633213 is a deficient number, since it is larger than the sum of its proper divisors (8108213727).

624561661633213 is an equidigital number, since it uses as much as digits as its factorization.

624561661633213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8108213726.

The product of its digits is 16796160, while the sum is 55.

The spelling of 624561661633213 in words is "six hundred twenty-four trillion, five hundred sixty-one billion, six hundred sixty-one million, six hundred thirty-three thousand, two hundred thirteen".