51649008669 has 8 divisors (see below), whose sum is σ = 76517049920. Its totient is φ = 34432672428.

The previous prime is 51649008611. The next prime is 51649008703. The reversal of 51649008669 is 96680094615.

It is a happy number.

51649008669 is a `hidden beast` number, since 5 + 16 + 490 + 0 + 86 + 69 = 666.

It is not a de Polignac number, because 51649008669 - 2⁸ = 51649008413 is a prime.

It is a super-3 number, since 3×51649008669³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649001669) 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, 956463097 + ... + 956463150.

It is an arithmetic number, because the mean of its divisors is an integer number (9564631240).

Almost surely, 2^51649008669 is an apocalyptic number.

It is an amenable number.

51649008669 is a deficient number, since it is larger than the sum of its proper divisors (24868041251).

51649008669 is a wasteful number, since it uses less digits than its factorization.

51649008669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912926256 (or 1912926250 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 51649008669 in words is "fifty-one billion, six hundred forty-nine million, eight thousand, six hundred sixty-nine".