51590555906 has 4 divisors (see below), whose sum is σ = 77385833862. Its totient is φ = 25795277952.

The previous prime is 51590555903. The next prime is 51590555909. The reversal of 51590555906 is 60955509515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60955509515 = 5 ⋅12191101903.

It is an interprime number because it is at equal distance from previous prime (51590555903) and next prime (51590555909).

It can be written as a sum of positive squares in only one way, i.e., 50424948025 + 1165607881 = 224555^2 + 34141^2 .

It is a super-2 number, since 2×51590555906² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51590555903) by changing a digit.

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, 12897638975 + ... + 12897638978.

Almost surely, 2^51590555906 is an apocalyptic number.

51590555906 is a deficient number, since it is larger than the sum of its proper divisors (25795277956).

51590555906 is a wasteful number, since it uses less digits than its factorization.

51590555906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25795277955.

The product of its (nonzero) digits is 1518750, while the sum is 50.

The spelling of 51590555906 in words is "fifty-one billion, five hundred ninety million, five hundred fifty-five thousand, nine hundred six".