61605061610591 has 2 divisors, whose sum is σ = 61605061610592. Its totient is φ = 61605061610590.

The previous prime is 61605061610569. The next prime is 61605061610611. The reversal of 61605061610591 is 19501616050616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61605061610591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61605061616591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802530805295 + 30802530805296.

It is an arithmetic number, because the mean of its divisors is an integer number (30802530805296).

Almost surely, 2^{61605061610591} is an apocalyptic number.

61605061610591 is a deficient number, since it is larger than the sum of its proper divisors (1).

61605061610591 is an equidigital number, since it uses as much as digits as its factorization.

61605061610591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 61605061610591 in words is "sixty-one trillion, six hundred five billion, sixty-one million, six hundred ten thousand, five hundred ninety-one".