1551551234257 has 2 divisors, whose sum is σ = 1551551234258. Its totient is φ = 1551551234256.

The previous prime is 1551551234227. The next prime is 1551551234293. The reversal of 1551551234257 is 7524321551551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1470262951936 + 81288282321 = 1212544^2 + 285111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551551234257 is a prime.

It is a super-2 number, since 2×1551551234257² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1551551234227) 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 as a sum of consecutive naturals, namely, 775775617128 + 775775617129.

It is an arithmetic number, because the mean of its divisors is an integer number (775775617129).

Almost surely, 2^{1551551234257} is an apocalyptic number.

It is an amenable number.

1551551234257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551551234257 is an equidigital number, since it uses as much as digits as its factorization.

1551551234257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050000, while the sum is 46.

The spelling of 1551551234257 in words is "one trillion, five hundred fifty-one billion, five hundred fifty-one million, two hundred thirty-four thousand, two hundred fifty-seven".