51637904065 has 8 divisors (see below), whose sum is σ = 67598710848. Its totient is φ = 37554839280.

The previous prime is 51637904057. The next prime is 51637904083. The reversal of 51637904065 is 56040973615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51637904065 - 2³ = 51637904057 is a prime.

It is a super-2 number, since 2×51637904065² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469435437 + ... + 469435546.

It is an arithmetic number, because the mean of its divisors is an integer number (8449838856).

Almost surely, 2^51637904065 is an apocalyptic number.

51637904065 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51637904065 is a deficient number, since it is larger than the sum of its proper divisors (15960806783).

51637904065 is a wasteful number, since it uses less digits than its factorization.

51637904065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938870999.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 51637904065 in words is "fifty-one billion, six hundred thirty-seven million, nine hundred four thousand, sixty-five".