75661009247 has 2 divisors, whose sum is σ = 75661009248. Its totient is φ = 75661009246.

The previous prime is 75661009243. The next prime is 75661009267. The reversal of 75661009247 is 74290016657.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75661009247 - 2² = 75661009243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75661009243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37830504623 + 37830504624.

It is an arithmetic number, because the mean of its divisors is an integer number (37830504624).

Almost surely, 2^75661009247 is an apocalyptic number.

75661009247 is a deficient number, since it is larger than the sum of its proper divisors (1).

75661009247 is an equidigital number, since it uses as much as digits as its factorization.

75661009247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 75661009247 in words is "seventy-five billion, six hundred sixty-one million, nine thousand, two hundred forty-seven".