61547045869 has 2 divisors, whose sum is σ = 61547045870. Its totient is φ = 61547045868.

The previous prime is 61547045851. The next prime is 61547045893. The reversal of 61547045869 is 96854074516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31253643369 + 30293402500 = 176787^2 + 174050^2 .

It is a cyclic number.

It is not a de Polignac number, because 61547045869 - 2¹⁷ = 61546914797 is a prime.

It is a super-2 number, since 2×61547045869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61547045809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30773522934 + 30773522935.

It is an arithmetic number, because the mean of its divisors is an integer number (30773522935).

Almost surely, 2^61547045869 is an apocalyptic number.

It is an amenable number.

61547045869 is a deficient number, since it is larger than the sum of its proper divisors (1).

61547045869 is an equidigital number, since it uses as much as digits as its factorization.

61547045869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 61547045869 in words is "sixty-one billion, five hundred forty-seven million, forty-five thousand, eight hundred sixty-nine".