69109661 has 4 divisors (see below), whose sum is σ = 69126300. Its totient is φ = 69093024.

The previous prime is 69109637. The next prime is 69109699. The reversal of 69109661 is 16690196.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 49084036 + 20025625 = 7006^2 + 4475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69109661 is a prime.

It is a super-3 number, since 3×69109661³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69139661) 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, 3695 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (17281575).

Almost surely, 2^69109661 is an apocalyptic number.

It is an amenable number.

69109661 is a deficient number, since it is larger than the sum of its proper divisors (16639).

69109661 is an equidigital number, since it uses as much as digits as its factorization.

69109661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16638.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 69109661 is about 8313.2220588650. Note that the first 3 decimals coincide. The cubic root of 69109661 is about 410.3737638657.

The spelling of 69109661 in words is "sixty-nine million, one hundred nine thousand, six hundred sixty-one".