51688675217402 has 16 divisors (see below), whose sum is σ = 83218350595752. Its totient is φ = 23990875845120.

The previous prime is 51688675217371. The next prime is 51688675217449. The reversal of 51688675217402 is 20471257688615.

It can be written as a sum of positive squares in 4 ways, for example, as 35342656410961 + 16346018806441 = 5944969^2 + 4043021^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10412704049 + ... + 10412709012.

Almost surely, 2^{51688675217402} is an apocalyptic number.

51688675217402 is a deficient number, since it is larger than the sum of its proper divisors (31529675378350).

51688675217402 is a wasteful number, since it uses less digits than its factorization.

51688675217402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20825413153.

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 51688675217402 in words is "fifty-one trillion, six hundred eighty-eight billion, six hundred seventy-five million, two hundred seventeen thousand, four hundred two".