51505655 has 16 divisors (see below), whose sum is σ = 64174464. Its totient is φ = 39655680.

The previous prime is 51505621. The next prime is 51505669. The reversal of 51505655 is 55650515.

It is not a de Polignac number, because 51505655 - 2¹⁰ = 51504631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12539 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (4010904).

Almost surely, 2^51505655 is an apocalyptic number.

51505655 is a deficient number, since it is larger than the sum of its proper divisors (12668809).

51505655 is a wasteful number, since it uses less digits than its factorization.

51505655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 51505655 is about 7176.7440389079. The cubic root of 51505655 is about 372.0645603254.

The spelling of 51505655 in words is "fifty-one million, five hundred five thousand, six hundred fifty-five".