61649626741 has 2 divisors, whose sum is σ = 61649626742. Its totient is φ = 61649626740.

The previous prime is 61649626729. The next prime is 61649626763. The reversal of 61649626741 is 14762694616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33331804900 + 28317821841 = 182570^2 + 168279^2 .

It is a cyclic number.

It is not a de Polignac number, because 61649626741 - 2¹¹ = 61649624693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61649626541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30824813370 + 30824813371.

It is an arithmetic number, because the mean of its divisors is an integer number (30824813371).

Almost surely, 2^61649626741 is an apocalyptic number.

It is an amenable number.

61649626741 is a deficient number, since it is larger than the sum of its proper divisors (1).

61649626741 is an equidigital number, since it uses as much as digits as its factorization.

61649626741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 52.

The spelling of 61649626741 in words is "sixty-one billion, six hundred forty-nine million, six hundred twenty-six thousand, seven hundred forty-one".