65099681 has 8 divisors (see below), whose sum is σ = 72557280. Its totient is φ = 58045248.

The previous prime is 65099669. The next prime is 65099701. The reversal of 65099681 is 18699056.

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 65099681 - 2¹⁸ = 64837537 is a prime.

It is a super-2 number, since 2×65099681² = 8475936932603522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65090681) 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, 100451 + ... + 101096.

It is an arithmetic number, because the mean of its divisors is an integer number (9069660).

Almost surely, 2^65099681 is an apocalyptic number.

It is an amenable number.

65099681 is a deficient number, since it is larger than the sum of its proper divisors (7457599).

65099681 is a wasteful number, since it uses less digits than its factorization.

65099681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201583.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 65099681 is about 8068.4373332139. The cubic root of 65099681 is about 402.2780041979.

The spelling of 65099681 in words is "sixty-five million, ninety-nine thousand, six hundred eighty-one".