613631702221 has 4 divisors (see below), whose sum is σ = 640311341472. Its totient is φ = 586952062972.

The previous prime is 613631702171. The next prime is 613631702251. The reversal of 613631702221 is 122207136316.

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 613631702221 - 2¹³ = 613631694029 is a prime.

It is a super-5 number, since 5×613631702221⁵ (a number of 60 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613631702251) 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, 13339819591 + ... + 13339819636.

It is an arithmetic number, because the mean of its divisors is an integer number (160077835368).

Almost surely, 2^613631702221 is an apocalyptic number.

It is an amenable number.

613631702221 is a deficient number, since it is larger than the sum of its proper divisors (26679639251).

613631702221 is a wasteful number, since it uses less digits than its factorization.

613631702221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26679639250.

The product of its (nonzero) digits is 18144, while the sum is 34.

Adding to 613631702221 its reverse (122207136316), we get a palindrome (735838838537).

It can be divided in two parts, 61363 and 1702221, that added together give a square (1763584 = 1328²).

The spelling of 613631702221 in words is "six hundred thirteen billion, six hundred thirty-one million, seven hundred two thousand, two hundred twenty-one".