83645551 has 8 divisors (see below), whose sum is σ = 91577808. Its totient is φ = 75768000.

The previous prime is 83645537. The next prime is 83645561. The reversal of 83645551 is 15554638.

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

It is not a de Polignac number, because 83645551 - 2⁹ = 83645039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83645551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83645521) 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, 10440 + ... + 16621.

It is an arithmetic number, because the mean of its divisors is an integer number (11447226).

Almost surely, 2^83645551 is an apocalyptic number.

83645551 is a deficient number, since it is larger than the sum of its proper divisors (7932257).

83645551 is a wasteful number, since it uses less digits than its factorization.

83645551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27353.

The product of its digits is 72000, while the sum is 37.

The square root of 83645551 is about 9145.7941699997. The cubic root of 83645551 is about 437.3350470392.

The spelling of 83645551 in words is "eighty-three million, six hundred forty-five thousand, five hundred fifty-one".