2661491461 has 2 divisors, whose sum is σ = 2661491462. Its totient is φ = 2661491460.

The previous prime is 2661491449. The next prime is 2661491467. The reversal of 2661491461 is 1641941662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2624512900 + 36978561 = 51230^2 + 6081^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661491461 - 2¹⁵ = 2661458693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661491467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330745730 + 1330745731.

It is an arithmetic number, because the mean of its divisors is an integer number (1330745731).

Almost surely, 2^2661491461 is an apocalyptic number.

It is an amenable number.

2661491461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661491461 is an equidigital number, since it uses as much as digits as its factorization.

2661491461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 2661491461 is about 51589.6449008907. The cubic root of 2661491461 is about 1385.8248959594.

The spelling of 2661491461 in words is "two billion, six hundred sixty-one million, four hundred ninety-one thousand, four hundred sixty-one".