51942665 has 8 divisors (see below), whose sum is σ = 62729160. Its totient is φ = 41288832.

The previous prime is 51942647. The next prime is 51942673. The reversal of 51942665 is 56624915.

It can be written as a sum of positive squares in 4 ways, for example, as 2226064 + 49716601 = 1492^2 + 7051^2 .

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 51942665 - 2⁶ = 51942601 is a prime.

It is a super-3 number, since 3×51942665³ (a number of 24 digits) contains 333 as substring.

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, 32300 + ... + 33869.

It is an arithmetic number, because the mean of its divisors is an integer number (7841145).

Almost surely, 2^51942665 is an apocalyptic number.

It is an amenable number.

51942665 is a deficient number, since it is larger than the sum of its proper divisors (10786495).

51942665 is a wasteful number, since it uses less digits than its factorization.

51942665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66331.

The product of its digits is 64800, while the sum is 38.

The square root of 51942665 is about 7207.1259875210. The cubic root of 51942665 is about 373.1138834839.

The spelling of 51942665 in words is "fifty-one million, nine hundred forty-two thousand, six hundred sixty-five".