9870058661 has 2 divisors, whose sum is σ = 9870058662. Its totient is φ = 9870058660.

The previous prime is 9870058657. The next prime is 9870058727. The reversal of 9870058661 is 1668500789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8334594436 + 1535464225 = 91294^2 + 39185^2 .

It is a cyclic number.

It is not a de Polignac number, because 9870058661 - 2² = 9870058657 is a prime.

It is a super-2 number, since 2×9870058661² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9870058061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4935029330 + 4935029331.

It is an arithmetic number, because the mean of its divisors is an integer number (4935029331).

Almost surely, 2^9870058661 is an apocalyptic number.

It is an amenable number.

9870058661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9870058661 is an equidigital number, since it uses as much as digits as its factorization.

9870058661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 9870058661 is about 99348.1688859941. The cubic root of 9870058661 is about 2145.0623057557.

The spelling of 9870058661 in words is "nine billion, eight hundred seventy million, fifty-eight thousand, six hundred sixty-one".