9997665554 has 8 divisors (see below), whose sum is σ = 15006967740. Its totient is φ = 4995342976.

The previous prime is 9997665551. The next prime is 9997665611. The reversal of 9997665554 is 4555667999.

It can be written as a sum of positive squares in 2 ways, for example, as 9995400529 + 2265025 = 99977^2 + 1505^2 .

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

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9997665551) 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, 1741319 + ... + 1747050.

Almost surely, 2^9997665554 is an apocalyptic number.

9997665554 is a deficient number, since it is larger than the sum of its proper divisors (5009302186).

9997665554 is a wasteful number, since it uses less digits than its factorization.

9997665554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489804.

The product of its digits is 91854000, while the sum is 65.

The square root of 9997665554 is about 99988.3270887157. The cubic root of 9997665554 is about 2154.2670299366.

The spelling of 9997665554 in words is "nine billion, nine hundred ninety-seven million, six hundred sixty-five thousand, five hundred fifty-four".