9979451855 has 8 divisors (see below), whose sum is σ = 12299000352. Its totient is φ = 7767789408.

The previous prime is 9979451819. The next prime is 9979451857. The reversal of 9979451855 is 5581549799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9979451855 - 2⁶ = 9979451791 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 (9979451857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26971307 + ... + 26971676.

It is an arithmetic number, because the mean of its divisors is an integer number (1537375044).

Almost surely, 2^9979451855 is an apocalyptic number.

9979451855 is a deficient number, since it is larger than the sum of its proper divisors (2319548497).

9979451855 is a wasteful number, since it uses less digits than its factorization.

9979451855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53943025.

The product of its digits is 20412000, while the sum is 62.

The square root of 9979451855 is about 99897.2064424226. The cubic root of 9979451855 is about 2152.9580235976.

The spelling of 9979451855 in words is "nine billion, nine hundred seventy-nine million, four hundred fifty-one thousand, eight hundred fifty-five".