99666761 has 4 divisors (see below), whose sum is σ = 104912400. Its totient is φ = 94421124.

The previous prime is 99666731. The next prime is 99666793. The reversal of 99666761 is 16766699.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16766699 = 1063 ⋅15773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99666761 is a prime.

It is a super-2 number, since 2×99666761² = 19866926496462242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99666731) 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, 2622791 + ... + 2622828.

It is an arithmetic number, because the mean of its divisors is an integer number (26228100).

Almost surely, 2^99666761 is an apocalyptic number.

It is an amenable number.

99666761 is a deficient number, since it is larger than the sum of its proper divisors (5245639).

99666761 is a wasteful number, since it uses less digits than its factorization.

99666761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5245638.

The product of its digits is 734832, while the sum is 50.

The square root of 99666761 is about 9983.3241457943. The cubic root of 99666761 is about 463.6427234468.

The spelling of 99666761 in words is "ninety-nine million, six hundred sixty-six thousand, seven hundred sixty-one".