61475777249 has 2 divisors, whose sum is σ = 61475777250. Its totient is φ = 61475777248.

The previous prime is 61475777227. The next prime is 61475777257. The reversal of 61475777249 is 94277757416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61178559649 + 297217600 = 247343^2 + 17240^2 .

It is a cyclic number.

It is not a de Polignac number, because 61475777249 - 2¹² = 61475773153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61475777269) 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, 30737888624 + 30737888625.

It is an arithmetic number, because the mean of its divisors is an integer number (30737888625).

Almost surely, 2^61475777249 is an apocalyptic number.

It is an amenable number.

61475777249 is a deficient number, since it is larger than the sum of its proper divisors (1).

61475777249 is an equidigital number, since it uses as much as digits as its factorization.

61475777249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20744640, while the sum is 59.

The spelling of 61475777249 in words is "sixty-one billion, four hundred seventy-five million, seven hundred seventy-seven thousand, two hundred forty-nine".