51426665 has 4 divisors (see below), whose sum is σ = 61712004. Its totient is φ = 41141328.

The previous prime is 51426659. The next prime is 51426671. The reversal of 51426665 is 56662415.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51426659) and next prime (51426671).

It can be written as a sum of positive squares in 2 ways, for example, as 40857664 + 10569001 = 6392^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 51426665 - 2¹⁰ = 51425641 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, 5142662 + ... + 5142671.

It is an arithmetic number, because the mean of its divisors is an integer number (15428001).

Almost surely, 2^51426665 is an apocalyptic number.

It is an amenable number.

51426665 is a deficient number, since it is larger than the sum of its proper divisors (10285339).

51426665 is a wasteful number, since it uses less digits than its factorization.

51426665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10285338.

The product of its digits is 43200, while the sum is 35.

The square root of 51426665 is about 7171.2387353929. The cubic root of 51426665 is about 371.8742613737.

The spelling of 51426665 in words is "fifty-one million, four hundred twenty-six thousand, six hundred sixty-five".