6421611361 has 4 divisors (see below), whose sum is σ = 7005394224. Its totient is φ = 5837828500.

The previous prime is 6421611349. The next prime is 6421611379. The reversal of 6421611361 is 1631161246.

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 6421611361 - 2¹⁵ = 6421578593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421611311) 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, 291891415 + ... + 291891436.

It is an arithmetic number, because the mean of its divisors is an integer number (1751348556).

Almost surely, 2^6421611361 is an apocalyptic number.

It is an amenable number.

6421611361 is a deficient number, since it is larger than the sum of its proper divisors (583782863).

6421611361 is a wasteful number, since it uses less digits than its factorization.

6421611361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583782862.

The product of its digits is 5184, while the sum is 31.

The square root of 6421611361 is about 80134.9571722603. The cubic root of 6421611361 is about 1858.7229991524.

The spelling of 6421611361 in words is "six billion, four hundred twenty-one million, six hundred eleven thousand, three hundred sixty-one".