51973346655 has 24 divisors (see below), whose sum is σ = 93423696912. Its totient is φ = 27719117568.

The previous prime is 51973346653. The next prime is 51973346687. The reversal of 51973346655 is 55664337915.

51973346655 is a `hidden beast` number, since 519 + 7 + 33 + 46 + 6 + 55 = 666.

It is not a de Polignac number, because 51973346655 - 2¹ = 51973346653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51973346653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21386994 + ... + 21389423.

It is an arithmetic number, because the mean of its divisors is an integer number (3892654038).

Almost surely, 2^51973346655 is an apocalyptic number.

51973346655 is a deficient number, since it is larger than the sum of its proper divisors (41450350257).

51973346655 is an equidigital number, since it uses as much as digits as its factorization.

51973346655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42776437 (or 42776425 counting only the distinct ones).

The product of its digits is 10206000, while the sum is 54.

The spelling of 51973346655 in words is "fifty-one billion, nine hundred seventy-three million, three hundred forty-six thousand, six hundred fifty-five".