9881062645 has 4 divisors (see below), whose sum is σ = 11857275180. Its totient is φ = 7904850112.

The previous prime is 9881062589. The next prime is 9881062673. The reversal of 9881062645 is 5462601889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5462601889 = 457 ⋅11953177.

It can be written as a sum of positive squares in 2 ways, for example, as 1698593796 + 8182468849 = 41214^2 + 90457^2 .

It is a cyclic number.

It is not a de Polignac number, because 9881062645 - 2¹¹ = 9881060597 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988106260 + ... + 988106269.

It is an arithmetic number, because the mean of its divisors is an integer number (2964318795).

Almost surely, 2^9881062645 is an apocalyptic number.

It is an amenable number.

9881062645 is a deficient number, since it is larger than the sum of its proper divisors (1976212535).

9881062645 is a wasteful number, since it uses less digits than its factorization.

9881062645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976212534.

The product of its (nonzero) digits is 829440, while the sum is 49.

The square root of 9881062645 is about 99403.5343687537. The cubic root of 9881062645 is about 2145.8591758834.

The spelling of 9881062645 in words is "nine billion, eight hundred eighty-one million, sixty-two thousand, six hundred forty-five".