9906545407 has 4 divisors (see below), whose sum is σ = 10807140456. Its totient is φ = 9005950360.

The previous prime is 9906545401. The next prime is 9906545417. The reversal of 9906545407 is 7045456099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7045456099 = 11 ⋅640496009.

It is not a de Polignac number, because 9906545407 - 2¹¹ = 9906543359 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 (9906545401) 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, 450297508 + ... + 450297529.

It is an arithmetic number, because the mean of its divisors is an integer number (2701785114).

Almost surely, 2^9906545407 is an apocalyptic number.

9906545407 is a deficient number, since it is larger than the sum of its proper divisors (900595049).

9906545407 is a wasteful number, since it uses less digits than its factorization.

9906545407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900595048.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The square root of 9906545407 is about 99531.6301835753. The cubic root of 9906545407 is about 2147.7022798804.

The spelling of 9906545407 in words is "nine billion, nine hundred six million, five hundred forty-five thousand, four hundred seven".