9985660051 has 4 divisors (see below), whose sum is σ = 9986659704. Its totient is φ = 9984660400.

The previous prime is 9985659919. The next prime is 9985660063. The reversal of 9985660051 is 1500665899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1500665899 = 15271 ⋅98269.

It is a cyclic number.

It is not a de Polignac number, because 9985660051 - 2¹¹ = 9985658003 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 Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9985659977 and 9985660004.

It is not an unprimeable number, because it can be changed into a prime (9985660081) 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, 484690 + ... + 504871.

It is an arithmetic number, because the mean of its divisors is an integer number (2496664926).

Almost surely, 2^9985660051 is an apocalyptic number.

9985660051 is a deficient number, since it is larger than the sum of its proper divisors (999653).

9985660051 is a wasteful number, since it uses less digits than its factorization.

9985660051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999652.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 9985660051 is about 99928.2745322864. The cubic root of 9985660051 is about 2153.4043812697.

The spelling of 9985660051 in words is "nine billion, nine hundred eighty-five million, six hundred sixty thousand, fifty-one".