9902127745 has 8 divisors (see below), whose sum is σ = 11884813416. Its totient is φ = 7920195456.

The previous prime is 9902127721. The next prime is 9902127773. The reversal of 9902127745 is 5477212099.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6408963136 + 3493164609 = 80056^2 + 59103^2 .

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 9902127745 - 2⁵ = 9902127713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9902127695 and 9902127704.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159012 + ... + 212341.

It is an arithmetic number, because the mean of its divisors is an integer number (1485601677).

Almost surely, 2^9902127745 is an apocalyptic number.

It is an amenable number.

9902127745 is a deficient number, since it is larger than the sum of its proper divisors (1982685671).

9902127745 is a wasteful number, since it uses less digits than its factorization.

9902127745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376691.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 9902127745 is about 99509.4354571465. The cubic root of 9902127745 is about 2147.3829881723.

The spelling of 9902127745 in words is "nine billion, nine hundred two million, one hundred twenty-seven thousand, seven hundred forty-five".