99155765 has 4 divisors (see below), whose sum is σ = 118986924. Its totient is φ = 79324608.

The previous prime is 99155743. The next prime is 99155767. The reversal of 99155765 is 56755199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56755199 = 71 ⋅799369.

It can be written as a sum of positive squares in 2 ways, for example, as 66961489 + 32194276 = 8183^2 + 5674^2 .

It is a cyclic number.

It is not a de Polignac number, because 99155765 - 2¹² = 99151669 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 (99155767) 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, 9915572 + ... + 9915581.

It is an arithmetic number, because the mean of its divisors is an integer number (29746731).

Almost surely, 2^99155765 is an apocalyptic number.

It is an amenable number.

99155765 is a deficient number, since it is larger than the sum of its proper divisors (19831159).

99155765 is a wasteful number, since it uses less digits than its factorization.

99155765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19831158.

The product of its digits is 425250, while the sum is 47.

The square root of 99155765 is about 9957.6987803408. The cubic root of 99155765 is about 462.8489929824.

The spelling of 99155765 in words is "ninety-nine million, one hundred fifty-five thousand, seven hundred sixty-five".