51649535999 has 8 divisors (see below), whose sum is σ = 52512590640. Its totient is φ = 50789192256.

The previous prime is 51649535933. The next prime is 51649536013. The reversal of 51649535999 is 99953594615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51649535999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649535299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639284 + ... + 715529.

It is an arithmetic number, because the mean of its divisors is an integer number (6564073830).

Almost surely, 2^51649535999 is an apocalyptic number.

51649535999 is a deficient number, since it is larger than the sum of its proper divisors (863054641).

51649535999 is a wasteful number, since it uses less digits than its factorization.

51649535999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355449.

The product of its digits is 59049000, while the sum is 65.

The spelling of 51649535999 in words is "fifty-one billion, six hundred forty-nine million, five hundred thirty-five thousand, nine hundred ninety-nine".