61011318569 has 2 divisors, whose sum is σ = 61011318570. Its totient is φ = 61011318568.

The previous prime is 61011318527. The next prime is 61011318583. The reversal of 61011318569 is 96581311016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58331910400 + 2679408169 = 241520^2 + 51763^2 .

It is a cyclic number.

It is not a de Polignac number, because 61011318569 - 2¹² = 61011314473 is a prime.

It is a super-2 number, since 2×61011318569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61011318169) 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, 30505659284 + 30505659285.

It is an arithmetic number, because the mean of its divisors is an integer number (30505659285).

Almost surely, 2^61011318569 is an apocalyptic number.

It is an amenable number.

61011318569 is a deficient number, since it is larger than the sum of its proper divisors (1).

61011318569 is an equidigital number, since it uses as much as digits as its factorization.

61011318569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 61011318569 in words is "sixty-one billion, eleven million, three hundred eighteen thousand, five hundred sixty-nine".