2621611673 has 2 divisors, whose sum is σ = 2621611674. Its totient is φ = 2621611672.

The previous prime is 2621611661. The next prime is 2621611763. The reversal of 2621611673 is 3761161262.

Together with next prime (2621611763) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2621132809 + 478864 = 51197^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621611673 - 2²⁰ = 2620563097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621611613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310805836 + 1310805837.

It is an arithmetic number, because the mean of its divisors is an integer number (1310805837).

Almost surely, 2^2621611673 is an apocalyptic number.

It is an amenable number.

2621611673 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621611673 is an equidigital number, since it uses as much as digits as its factorization.

2621611673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 2621611673 is about 51201.6764666939. The cubic root of 2621611673 is about 1378.8683001062.

The spelling of 2621611673 in words is "two billion, six hundred twenty-one million, six hundred eleven thousand, six hundred seventy-three".