51634040661 has 12 divisors (see below), whose sum is σ = 85237146592. Its totient is φ = 29505166056.

The previous prime is 51634040657. The next prime is 51634040671. The reversal of 51634040661 is 16604043615.

It is a happy number.

51634040661 is a `hidden beast` number, since 516 + 3 + 40 + 40 + 6 + 61 = 666.

It is not a de Polignac number, because 51634040661 - 2² = 51634040657 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 (51634040621) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 409793911 + ... + 409794036.

Almost surely, 2^51634040661 is an apocalyptic number.

It is an amenable number.

51634040661 is a deficient number, since it is larger than the sum of its proper divisors (33603105931).

51634040661 is a wasteful number, since it uses less digits than its factorization.

51634040661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819587960 (or 819587957 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 51634040661 in words is "fifty-one billion, six hundred thirty-four million, forty thousand, six hundred sixty-one".