61811527691 has 2 divisors, whose sum is σ = 61811527692. Its totient is φ = 61811527690.

The previous prime is 61811527639. The next prime is 61811527697. The reversal of 61811527691 is 19672511816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61811527691 - 2¹⁸ = 61811265547 is a prime.

It is not a weakly prime, because it can be changed into another prime (61811527697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905763845 + 30905763846.

It is an arithmetic number, because the mean of its divisors is an integer number (30905763846).

Almost surely, 2^61811527691 is an apocalyptic number.

61811527691 is a deficient number, since it is larger than the sum of its proper divisors (1).

61811527691 is an equidigital number, since it uses as much as digits as its factorization.

61811527691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The spelling of 61811527691 in words is "sixty-one billion, eight hundred eleven million, five hundred twenty-seven thousand, six hundred ninety-one".