99661407 has 8 divisors (see below), whose sum is σ = 132936960. Its totient is φ = 66413400.

The previous prime is 99661381. The next prime is 99661417. The reversal of 99661407 is 70416699.

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

It is not a de Polignac number, because 99661407 - 2⁸ = 99661151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4032 + ... + 14682.

It is an arithmetic number, because the mean of its divisors is an integer number (16617120).

Almost surely, 2^99661407 is an apocalyptic number.

99661407 is a deficient number, since it is larger than the sum of its proper divisors (33275553).

99661407 is a wasteful number, since it uses less digits than its factorization.

99661407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13773.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 99661407 is about 9983.0559950348. The cubic root of 99661407 is about 463.6344211551.

The spelling of 99661407 in words is "ninety-nine million, six hundred sixty-one thousand, four hundred seven".