9870315661 has 4 divisors (see below), whose sum is σ = 9872121312. Its totient is φ = 9868510012.

The previous prime is 9870315629. The next prime is 9870315683. The reversal of 9870315661 is 1665130789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9870315661 - 2⁵ = 9870315629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9870315691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894601 + ... + 905566.

It is an arithmetic number, because the mean of its divisors is an integer number (2468030328).

Almost surely, 2^9870315661 is an apocalyptic number.

It is an amenable number.

9870315661 is a deficient number, since it is larger than the sum of its proper divisors (1805651).

9870315661 is a wasteful number, since it uses less digits than its factorization.

9870315661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805650.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 9870315661 is about 99349.4623085601. The cubic root of 9870315661 is about 2145.0809235521.

The spelling of 9870315661 in words is "nine billion, eight hundred seventy million, three hundred fifteen thousand, six hundred sixty-one".