9851566537 has 2 divisors, whose sum is σ = 9851566538. Its totient is φ = 9851566536.

The previous prime is 9851566511. The next prime is 9851566547. The reversal of 9851566537 is 7356651589.

9851566537 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6864288201 + 2987278336 = 82851^2 + 54656^2 .

It is a cyclic number.

It is not a de Polignac number, because 9851566537 - 2¹⁹ = 9851042249 is a prime.

It is not a weakly prime, because it can be changed into another prime (9851566547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4925783268 + 4925783269.

It is an arithmetic number, because the mean of its divisors is an integer number (4925783269).

Almost surely, 2^9851566537 is an apocalyptic number.

It is an amenable number.

9851566537 is a deficient number, since it is larger than the sum of its proper divisors (1).

9851566537 is an equidigital number, since it uses as much as digits as its factorization.

9851566537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 55.

The square root of 9851566537 is about 99255.0579920238. The cubic root of 9851566537 is about 2143.7218356201.

The spelling of 9851566537 in words is "nine billion, eight hundred fifty-one million, five hundred sixty-six thousand, five hundred thirty-seven".