61632261521 has 2 divisors, whose sum is σ = 61632261522. Its totient is φ = 61632261520.

The previous prime is 61632261517. The next prime is 61632261529. The reversal of 61632261521 is 12516223616.

61632261521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61188948496 + 443313025 = 247364^2 + 21055^2 .

It is a cyclic number.

It is not a de Polignac number, because 61632261521 - 2² = 61632261517 is a prime.

It is not a weakly prime, because it can be changed into another prime (61632261529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30816130760 + 30816130761.

It is an arithmetic number, because the mean of its divisors is an integer number (30816130761).

Almost surely, 2^61632261521 is an apocalyptic number.

It is an amenable number.

61632261521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61632261521 is an equidigital number, since it uses as much as digits as its factorization.

61632261521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The spelling of 61632261521 in words is "sixty-one billion, six hundred thirty-two million, two hundred sixty-one thousand, five hundred twenty-one".