61249823977 has 2 divisors, whose sum is σ = 61249823978. Its totient is φ = 61249823976.

The previous prime is 61249823911. The next prime is 61249823981. The reversal of 61249823977 is 77932894216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43405138921 + 17844685056 = 208339^2 + 133584^2 .

It is a cyclic number.

It is not a de Polignac number, because 61249823977 - 2⁷ = 61249823849 is a prime.

It is not a weakly prime, because it can be changed into another prime (61249823477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30624911988 + 30624911989.

It is an arithmetic number, because the mean of its divisors is an integer number (30624911989).

Almost surely, 2^61249823977 is an apocalyptic number.

It is an amenable number.

61249823977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61249823977 is an equidigital number, since it uses as much as digits as its factorization.

61249823977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The spelling of 61249823977 in words is "sixty-one billion, two hundred forty-nine million, eight hundred twenty-three thousand, nine hundred seventy-seven".