51123668 has 6 divisors (see below), whose sum is σ = 89466426. Its totient is φ = 25561832.

The previous prime is 51123659. The next prime is 51123691. The reversal of 51123668 is 86632115.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 35976004 + 15147664 = 5998^2 + 3892^2 .

It is a super-2 number, since 2×51123668² = 5227258859548448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6390455 + ... + 6390462.

It is an arithmetic number, because the mean of its divisors is an integer number (14911071).

Almost surely, 2^51123668 is an apocalyptic number.

It is an amenable number.

51123668 is a deficient number, since it is larger than the sum of its proper divisors (38342758).

51123668 is a wasteful number, since it uses less digits than its factorization.

51123668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780921 (or 12780919 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 51123668 is about 7150.0816778552. The cubic root of 51123668 is about 371.1424827431.

The spelling of 51123668 in words is "fifty-one million, one hundred twenty-three thousand, six hundred sixty-eight".