6612722261 has 4 divisors (see below), whose sum is σ = 6676923552. Its totient is φ = 6548520972.

The previous prime is 6612722239. The next prime is 6612722279. The reversal of 6612722261 is 1622272166.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1622272166 = 2 ⋅811136083.

It is a cyclic number.

It is not a de Polignac number, because 6612722261 - 2³⁰ = 5538980437 is a prime.

It is a super-2 number, since 2×6612722261² = 87456191402249904242, which contains 22 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 (6612722231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32100491 + ... + 32100696.

It is an arithmetic number, because the mean of its divisors is an integer number (1669230888).

Almost surely, 2^6612722261 is an apocalyptic number.

It is an amenable number.

6612722261 is a deficient number, since it is larger than the sum of its proper divisors (64201291).

6612722261 is a wasteful number, since it uses less digits than its factorization.

6612722261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64201290.

The product of its digits is 24192, while the sum is 35.

The square root of 6612722261 is about 81318.6464533197. The cubic root of 6612722261 is about 1876.9819408792.

It can be divided in two parts, 66127 and 22261, that added together give a palindrome (88388).

The spelling of 6612722261 in words is "six billion, six hundred twelve million, seven hundred twenty-two thousand, two hundred sixty-one".