61655056501 has 2 divisors, whose sum is σ = 61655056502. Its totient is φ = 61655056500.

The previous prime is 61655056457. The next prime is 61655056571. The reversal of 61655056501 is 10565055616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48812274225 + 12842782276 = 220935^2 + 113326^2 .

It is a cyclic number.

It is not a de Polignac number, because 61655056501 - 2⁹ = 61655055989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61655056571) 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, 30827528250 + 30827528251.

It is an arithmetic number, because the mean of its divisors is an integer number (30827528251).

Almost surely, 2^61655056501 is an apocalyptic number.

It is an amenable number.

61655056501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61655056501 is an equidigital number, since it uses as much as digits as its factorization.

61655056501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 61655056501 in words is "sixty-one billion, six hundred fifty-five million, fifty-six thousand, five hundred one".