51661755963 has 16 divisors (see below), whose sum is σ = 76777385760. Its totient is φ = 34332517728.

The previous prime is 51661755947. The next prime is 51661755983. The reversal of 51661755963 is 36955716615.

51661755963 is a `hidden beast` number, since 5 + 16 + 6 + 17 + 559 + 63 = 666.

It is not a de Polignac number, because 51661755963 - 2⁴ = 51661755947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51661755913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3009420 + ... + 3026537.

It is an arithmetic number, because the mean of its divisors is an integer number (4798586610).

Almost surely, 2^51661755963 is an apocalyptic number.

51661755963 is a deficient number, since it is larger than the sum of its proper divisors (25115629797).

51661755963 is a wasteful number, since it uses less digits than its factorization.

51661755963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6036283 (or 6036277 counting only the distinct ones).

The product of its digits is 5103000, while the sum is 54.

The spelling of 51661755963 in words is "fifty-one billion, six hundred sixty-one million, seven hundred fifty-five thousand, nine hundred sixty-three".