61631755469 has 2 divisors, whose sum is σ = 61631755470. Its totient is φ = 61631755468.

The previous prime is 61631755459. The next prime is 61631755541. The reversal of 61631755469 is 96455713616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55301166244 + 6330589225 = 235162^2 + 79565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61631755469 is a prime.

It is a super-2 number, since 2×61631755469² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61631755469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61631755429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30815877734 + 30815877735.

It is an arithmetic number, because the mean of its divisors is an integer number (30815877735).

Almost surely, 2^61631755469 is an apocalyptic number.

It is an amenable number.

61631755469 is a deficient number, since it is larger than the sum of its proper divisors (1).

61631755469 is an equidigital number, since it uses as much as digits as its factorization.

61631755469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 53.

The spelling of 61631755469 in words is "sixty-one billion, six hundred thirty-one million, seven hundred fifty-five thousand, four hundred sixty-nine".