51662785 has 4 divisors (see below), whose sum is σ = 61995348. Its totient is φ = 41330224.

The previous prime is 51662773. The next prime is 51662797. The reversal of 51662785 is 58726615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58726615 = 5 ⋅11745323.

It is an interprime number because it is at equal distance from previous prime (51662773) and next prime (51662797).

It can be written as a sum of positive squares in 2 ways, for example, as 14684224 + 36978561 = 3832^2 + 6081^2 .

It is a cyclic number.

It is not a de Polignac number, because 51662785 - 2²⁵ = 18108353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166274 + ... + 5166283.

It is an arithmetic number, because the mean of its divisors is an integer number (15498837).

Almost surely, 2^51662785 is an apocalyptic number.

It is an amenable number.

51662785 is a deficient number, since it is larger than the sum of its proper divisors (10332563).

51662785 is a wasteful number, since it uses less digits than its factorization.

51662785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332562.

The product of its digits is 100800, while the sum is 40.

The square root of 51662785 is about 7187.6828672389. The cubic root of 51662785 is about 372.4425327620.

The spelling of 51662785 in words is "fifty-one million, six hundred sixty-two thousand, seven hundred eighty-five".