61447958969 has 2 divisors, whose sum is σ = 61447958970. Its totient is φ = 61447958968.

The previous prime is 61447958921. The next prime is 61447958977. The reversal of 61447958969 is 96985974416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61398397369 + 49561600 = 247787^2 + 7040^2 .

It is a cyclic number.

It is not a de Polignac number, because 61447958969 - 2⁸ = 61447958713 is a prime.

It is a super-2 number, since 2×61447958969² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61447958899 and 61447958908.

It is not a weakly prime, because it can be changed into another prime (61447958989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30723979484 + 30723979485.

It is an arithmetic number, because the mean of its divisors is an integer number (30723979485).

Almost surely, 2^61447958969 is an apocalyptic number.

It is an amenable number.

61447958969 is a deficient number, since it is larger than the sum of its proper divisors (1).

61447958969 is an equidigital number, since it uses as much as digits as its factorization.

61447958969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 68.

The spelling of 61447958969 in words is "sixty-one billion, four hundred forty-seven million, nine hundred fifty-eight thousand, nine hundred sixty-nine".