51661105 has 8 divisors (see below), whose sum is σ = 64688832. Its totient is φ = 39531888.

The previous prime is 51661073. The next prime is 51661117. The reversal of 51661105 is 50116615.

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 51661105 - 2⁵ = 51661073 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 51661105.

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, 224499 + ... + 224728.

It is an arithmetic number, because the mean of its divisors is an integer number (8086104).

Almost surely, 2^51661105 is an apocalyptic number.

It is an amenable number.

51661105 is a deficient number, since it is larger than the sum of its proper divisors (13027727).

51661105 is a wasteful number, since it uses less digits than its factorization.

51661105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449255.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51661105 is about 7187.5659996970. The cubic root of 51661105 is about 372.4384956184.

The spelling of 51661105 in words is "fifty-one million, six hundred sixty-one thousand, one hundred five".