7981885501 has 2 divisors, whose sum is σ = 7981885502. Its totient is φ = 7981885500.

The previous prime is 7981885493. The next prime is 7981885529. The reversal of 7981885501 is 1055881897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7971811225 + 10074276 = 89285^2 + 3174^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981885501 - 2³ = 7981885493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7981885531) 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, 3990942750 + 3990942751.

It is an arithmetic number, because the mean of its divisors is an integer number (3990942751).

Almost surely, 2^7981885501 is an apocalyptic number.

It is an amenable number.

7981885501 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981885501 is an equidigital number, since it uses as much as digits as its factorization.

7981885501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 52.

The square root of 7981885501 is about 89341.3985843069. The cubic root of 7981885501 is about 1998.4893176233.

The spelling of 7981885501 in words is "seven billion, nine hundred eighty-one million, eight hundred eighty-five thousand, five hundred one".