9975778381 has 8 divisors (see below), whose sum is σ = 10563557760. Its totient is φ = 9388106688.

The previous prime is 9975778367. The next prime is 9975778399. The reversal of 9975778381 is 1838775799.

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 9975778381 - 2¹⁵ = 9975745613 is a prime.

It is a super-2 number, since 2×9975778381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9975778301) 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, 238860 + ... + 277498.

It is an arithmetic number, because the mean of its divisors is an integer number (1320444720).

Almost surely, 2^9975778381 is an apocalyptic number.

It is an amenable number.

9975778381 is a deficient number, since it is larger than the sum of its proper divisors (587779379).

9975778381 is a wasteful number, since it uses less digits than its factorization.

9975778381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53843.

The product of its digits is 26671680, while the sum is 64.

The square root of 9975778381 is about 99878.8184801963. The cubic root of 9975778381 is about 2152.6938205111.

The spelling of 9975778381 in words is "nine billion, nine hundred seventy-five million, seven hundred seventy-eight thousand, three hundred eighty-one".