51783671961 has 48 divisors (see below), whose sum is σ = 92886077440. Its totient is φ = 27128947680.

The previous prime is 51783671941. The next prime is 51783671971. The reversal of 51783671961 is 16917638715.

51783671961 is a `hidden beast` number, since 517 + 8 + 3 + 67 + 1 + 9 + 61 = 666.

It is not a de Polignac number, because 51783671961 - 2¹¹ = 51783669913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51783671898 and 51783671907.

It is not an unprimeable number, because it can be changed into a prime (51783671941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 660655 + ... + 734868.

Almost surely, 2^51783671961 is an apocalyptic number.

It is an amenable number.

51783671961 is a deficient number, since it is larger than the sum of its proper divisors (41102405479).

51783671961 is a wasteful number, since it uses less digits than its factorization.

51783671961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395586 (or 1395583 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 51783671961 in words is "fifty-one billion, seven hundred eighty-three million, six hundred seventy-one thousand, nine hundred sixty-one".