99902661 has 8 divisors (see below), whose sum is σ = 133442400. Its totient is φ = 66482352.

The previous prime is 99902653. The next prime is 99902771. The reversal of 99902661 is 16620999.

It is a happy number.

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

It is not a de Polignac number, because 99902661 - 2³ = 99902653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99902611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27886 + ... + 31263.

It is an arithmetic number, because the mean of its divisors is an integer number (16680300).

Almost surely, 2^99902661 is an apocalyptic number.

It is an amenable number.

99902661 is a deficient number, since it is larger than the sum of its proper divisors (33539739).

99902661 is a wasteful number, since it uses less digits than its factorization.

99902661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59715.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 99902661 is about 9995.1318650631. The cubic root of 99902661 is about 464.0082319313.

The spelling of 99902661 in words is "ninety-nine million, nine hundred two thousand, six hundred sixty-one".