83261665 has 8 divisors (see below), whose sum is σ = 105791400. Its totient is φ = 62691072.

The previous prime is 83261641. The next prime is 83261669. The reversal of 83261665 is 56616238.

It can be written as a sum of positive squares in 4 ways, for example, as 8456464 + 74805201 = 2908^2 + 8649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83261665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83261669) 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, 489690 + ... + 489859.

It is an arithmetic number, because the mean of its divisors is an integer number (13223925).

Almost surely, 2^83261665 is an apocalyptic number.

83261665 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

83261665 is a deficient number, since it is larger than the sum of its proper divisors (22529735).

83261665 is a wasteful number, since it uses less digits than its factorization.

83261665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979571.

The product of its digits is 51840, while the sum is 37.

The square root of 83261665 is about 9124.7830111187. The cubic root of 83261665 is about 436.6649803430.

The spelling of 83261665 in words is "eighty-three million, two hundred sixty-one thousand, six hundred sixty-five".