83661515 has 8 divisors (see below), whose sum is σ = 114735840. Its totient is φ = 57367872.

The previous prime is 83661509. The next prime is 83661521. The reversal of 83661515 is 51516638.

It is an interprime number because it is at equal distance from previous prime (83661509) and next prime (83661521).

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 83661515 - 2¹⁰ = 83660491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 2390329 = 83661515 / (8 + 3 + 6 + 6 + 1 + 5 + 1 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1195130 + ... + 1195199.

It is an arithmetic number, because the mean of its divisors is an integer number (14341980).

Almost surely, 2^83661515 is an apocalyptic number.

83661515 is a deficient number, since it is larger than the sum of its proper divisors (31074325).

83661515 is a wasteful number, since it uses less digits than its factorization.

83661515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390341.

The product of its digits is 21600, while the sum is 35.

The square root of 83661515 is about 9146.6668792517. Note that the first 3 decimals coincide. The cubic root of 83661515 is about 437.3628674971.

The spelling of 83661515 in words is "eighty-three million, six hundred sixty-one thousand, five hundred fifteen".