51235015661 has 8 divisors (see below), whose sum is σ = 52622967264. Its totient is φ = 49847233680.

The previous prime is 51235015651. The next prime is 51235015673. The reversal of 51235015661 is 16651053215.

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-51235015661 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 (51235015651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786026 + ... + 848708.

It is an arithmetic number, because the mean of its divisors is an integer number (6577870908).

Almost surely, 2^51235015661 is an apocalyptic number.

It is an amenable number.

51235015661 is a deficient number, since it is larger than the sum of its proper divisors (1387951603).

51235015661 is a wasteful number, since it uses less digits than its factorization.

51235015661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84811.

The product of its (nonzero) digits is 27000, while the sum is 35.

Adding to 51235015661 its reverse (16651053215), we get a palindrome (67886068876).

The spelling of 51235015661 in words is "fifty-one billion, two hundred thirty-five million, fifteen thousand, six hundred sixty-one".