61512206771 has 2 divisors, whose sum is σ = 61512206772. Its totient is φ = 61512206770.

The previous prime is 61512206747. The next prime is 61512206783. The reversal of 61512206771 is 17760221516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61512206771 is a prime.

It is not a weakly prime, because it can be changed into another prime (61512206711) 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, 30756103385 + 30756103386.

It is an arithmetic number, because the mean of its divisors is an integer number (30756103386).

Almost surely, 2^61512206771 is an apocalyptic number.

61512206771 is a deficient number, since it is larger than the sum of its proper divisors (1).

61512206771 is an equidigital number, since it uses as much as digits as its factorization.

61512206771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 61512206771 in words is "sixty-one billion, five hundred twelve million, two hundred six thousand, seven hundred seventy-one".