75835979521 has 2 divisors, whose sum is σ = 75835979522. Its totient is φ = 75835979520.

The previous prime is 75835979509. The next prime is 75835979561. The reversal of 75835979521 is 12597953857.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45245969521 + 30590010000 = 212711^2 + 174900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75835979521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75835979521.

It is not a weakly prime, because it can be changed into another prime (75835979561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37917989760 + 37917989761.

It is an arithmetic number, because the mean of its divisors is an integer number (37917989761).

Almost surely, 2^75835979521 is an apocalyptic number.

It is an amenable number.

75835979521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75835979521 is an equidigital number, since it uses as much as digits as its factorization.

75835979521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814000, while the sum is 61.

The spelling of 75835979521 in words is "seventy-five billion, eight hundred thirty-five million, nine hundred seventy-nine thousand, five hundred twenty-one".