61252705621 has 2 divisors, whose sum is σ = 61252705622. Its totient is φ = 61252705620.

The previous prime is 61252705541. The next prime is 61252705639. The reversal of 61252705621 is 12650725216.

61252705621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61051491396 + 201214225 = 247086^2 + 14185^2 .

It is a cyclic number.

It is not a de Polignac number, because 61252705621 - 2¹¹ = 61252703573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61252705681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30626352810 + 30626352811.

It is an arithmetic number, because the mean of its divisors is an integer number (30626352811).

Almost surely, 2^61252705621 is an apocalyptic number.

It is an amenable number.

61252705621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61252705621 is an equidigital number, since it uses as much as digits as its factorization.

61252705621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 61252705621 in words is "sixty-one billion, two hundred fifty-two million, seven hundred five thousand, six hundred twenty-one".