2661212537 has 2 divisors, whose sum is σ = 2661212538. Its totient is φ = 2661212536.

The previous prime is 2661212507. The next prime is 2661212629. The reversal of 2661212537 is 7352121662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2384954896 + 276257641 = 48836^2 + 16621^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661212537 - 2³⁰ = 1587470713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2661212497 and 2661212506.

It is not a weakly prime, because it can be changed into another prime (2661212507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330606268 + 1330606269.

It is an arithmetic number, because the mean of its divisors is an integer number (1330606269).

Almost surely, 2^2661212537 is an apocalyptic number.

It is an amenable number.

2661212537 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661212537 is an equidigital number, since it uses as much as digits as its factorization.

2661212537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 2661212537 is about 51586.9415356251. The cubic root of 2661212537 is about 1385.7764828380.

The spelling of 2661212537 in words is "two billion, six hundred sixty-one million, two hundred twelve thousand, five hundred thirty-seven".