99661437 has 6 divisors (see below), whose sum is σ = 143955422. Its totient is φ = 66440952.

The previous prime is 99661433. The next prime is 99661451. The reversal of 99661437 is 73416699.

It can be written as a sum of positive squares in only one way, i.e., 60047001 + 39614436 = 7749^2 + 6294^2 .

It is not a de Polignac number, because 99661437 - 2² = 99661433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99661392 and 99661401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661433) 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 5 ways as a sum of consecutive naturals, for example, 5536738 + ... + 5536755.

Almost surely, 2^99661437 is an apocalyptic number.

It is an amenable number.

99661437 is a deficient number, since it is larger than the sum of its proper divisors (44293985).

99661437 is a wasteful number, since it uses less digits than its factorization.

99661437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11073499 (or 11073496 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 99661437 is about 9983.0574975806. The cubic root of 99661437 is about 463.6344676760.

The spelling of 99661437 in words is "ninety-nine million, six hundred sixty-one thousand, four hundred thirty-seven".