61651116205571 has 2 divisors, whose sum is σ = 61651116205572. Its totient is φ = 61651116205570.

The previous prime is 61651116205559. The next prime is 61651116205583. The reversal of 61651116205571 is 17550261115616.

It is a balanced prime because it is at equal distance from previous prime (61651116205559) and next prime (61651116205583).

It is a cyclic number.

It is not a de Polignac number, because 61651116205571 - 2²² = 61651112011267 is a prime.

It is not a weakly prime, because it can be changed into another prime (61651116205531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825558102785 + 30825558102786.

It is an arithmetic number, because the mean of its divisors is an integer number (30825558102786).

Almost surely, 2^{61651116205571} is an apocalyptic number.

61651116205571 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651116205571 is an equidigital number, since it uses as much as digits as its factorization.

61651116205571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 47.

The spelling of 61651116205571 in words is "sixty-one trillion, six hundred fifty-one billion, one hundred sixteen million, two hundred five thousand, five hundred seventy-one".