9965632451 has 4 divisors (see below), whose sum is σ = 10177667232. Its totient is φ = 9753597672.

The previous prime is 9965632423. The next prime is 9965632549. The reversal of 9965632451 is 1542365699.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9965632451 - 2²² = 9961438147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9965632451.

It is not an unprimeable number, because it can be changed into a prime (9965632421) 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, 106017320 + ... + 106017413.

It is an arithmetic number, because the mean of its divisors is an integer number (2544416808).

Almost surely, 2^9965632451 is an apocalyptic number.

9965632451 is a deficient number, since it is larger than the sum of its proper divisors (212034781).

9965632451 is a wasteful number, since it uses less digits than its factorization.

9965632451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212034780.

The product of its digits is 1749600, while the sum is 50.

The square root of 9965632451 is about 99828.0143596976. The cubic root of 9965632451 is about 2151.9637692240.

The spelling of 9965632451 in words is "nine billion, nine hundred sixty-five million, six hundred thirty-two thousand, four hundred fifty-one".