9865977901 has 4 divisors (see below), whose sum is σ = 10624899292. Its totient is φ = 9107056512.

The previous prime is 9865977893. The next prime is 9865977941. The reversal of 9865977901 is 1097795689.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6166175625 + 3699802276 = 78525^2 + 60826^2 .

It is a cyclic number.

It is not a de Polignac number, because 9865977901 - 2³ = 9865977893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9865977901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865977941) 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, 379460676 + ... + 379460701.

It is an arithmetic number, because the mean of its divisors is an integer number (2656224823).

Almost surely, 2^9865977901 is an apocalyptic number.

It is an amenable number.

9865977901 is a deficient number, since it is larger than the sum of its proper divisors (758921391).

9865977901 is a wasteful number, since it uses less digits than its factorization.

9865977901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758921390.

The product of its (nonzero) digits is 8573040, while the sum is 61.

The square root of 9865977901 is about 99327.6290918091. The cubic root of 9865977901 is about 2144.7666408090.

The spelling of 9865977901 in words is "nine billion, eight hundred sixty-five million, nine hundred seventy-seven thousand, nine hundred one".