75521138790847 has 2 divisors, whose sum is σ = 75521138790848. Its totient is φ = 75521138790846.

The previous prime is 75521138790809. The next prime is 75521138790901. The reversal of 75521138790847 is 74809783112557.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75521138790847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75521138790347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37760569395423 + 37760569395424.

It is an arithmetic number, because the mean of its divisors is an integer number (37760569395424).

Almost surely, 2^{75521138790847} is an apocalyptic number.

75521138790847 is a deficient number, since it is larger than the sum of its proper divisors (1).

75521138790847 is an equidigital number, since it uses as much as digits as its factorization.

75521138790847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118540800, while the sum is 67.

The spelling of 75521138790847 in words is "seventy-five trillion, five hundred twenty-one billion, one hundred thirty-eight million, seven hundred ninety thousand, eight hundred forty-seven".