1657055551817 has 2 divisors, whose sum is σ = 1657055551818. Its totient is φ = 1657055551816.

The previous prime is 1657055551769. The next prime is 1657055551871. The reversal of 1657055551817 is 7181555507561.

It is a happy number.

Together with next prime (1657055551871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 869796851641 + 787258700176 = 932629^2 + 887276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657055551817 - 2¹⁴ = 1657055535433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1657055553817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828527775908 + 828527775909.

It is an arithmetic number, because the mean of its divisors is an integer number (828527775909).

Almost surely, 2^{1657055551817} is an apocalyptic number.

It is an amenable number.

1657055551817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657055551817 is an equidigital number, since it uses as much as digits as its factorization.

1657055551817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7350000, while the sum is 56.

The spelling of 1657055551817 in words is "one trillion, six hundred fifty-seven billion, fifty-five million, five hundred fifty-one thousand, eight hundred seventeen".