51453203656 has 8 divisors (see below), whose sum is σ = 96474756870. Its totient is φ = 25726601824.

The previous prime is 51453203651. The next prime is 51453203713. The reversal of 51453203656 is 65630235415.

It can be written as a sum of positive squares in only one way, i.e., 38789302500 + 12663901156 = 196950^2 + 112534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51453203651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215825221 + ... + 3215825236.

Almost surely, 2^51453203656 is an apocalyptic number.

It is an amenable number.

51453203656 is a deficient number, since it is larger than the sum of its proper divisors (45021553214).

51453203656 is a wasteful number, since it uses less digits than its factorization.

51453203656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431650463 (or 6431650459 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 51453203656 in words is "fifty-one billion, four hundred fifty-three million, two hundred three thousand, six hundred fifty-six".