51061665 has 16 divisors (see below), whose sum is σ = 83907648. Its totient is φ = 26496576.

The previous prime is 51061657. The next prime is 51061667. The reversal of 51061665 is 56616015.

It is not a de Polignac number, because 51061665 - 2³ = 51061657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51061667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45447 + ... + 46556.

It is an arithmetic number, because the mean of its divisors is an integer number (5244228).

Almost surely, 2^51061665 is an apocalyptic number.

It is an amenable number.

51061665 is a deficient number, since it is larger than the sum of its proper divisors (32845983).

51061665 is a wasteful number, since it uses less digits than its factorization.

51061665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92048.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 51061665 is about 7145.7445378351. The cubic root of 51061665 is about 370.9923809897.

The spelling of 51061665 in words is "fifty-one million, sixty-one thousand, six hundred sixty-five".