99780661 has 8 divisors (see below), whose sum is σ = 103182848. Its totient is φ = 96390000.

The previous prime is 99780643. The next prime is 99780673. The reversal of 99780661 is 16608799.

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 99780661 - 2¹⁹ = 99256373 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 (99780641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17011 + ... + 22111.

It is an arithmetic number, because the mean of its divisors is an integer number (12897856).

Almost surely, 2^99780661 is an apocalyptic number.

It is an amenable number.

99780661 is a deficient number, since it is larger than the sum of its proper divisors (3402187).

99780661 is a wasteful number, since it uses less digits than its factorization.

99780661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 99780661 is about 9989.0270296961. The cubic root of 99780661 is about 463.8192744575.

The spelling of 99780661 in words is "ninety-nine million, seven hundred eighty thousand, six hundred sixty-one".