1553666515231 has 2 divisors, whose sum is σ = 1553666515232. Its totient is φ = 1553666515230.

The previous prime is 1553666515217. The next prime is 1553666515273. The reversal of 1553666515231 is 1325156663551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1553666515231 - 2¹¹ = 1553666513183 is a prime.

It is a super-2 number, since 2×1553666515231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553666545231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776833257615 + 776833257616.

It is an arithmetic number, because the mean of its divisors is an integer number (776833257616).

Almost surely, 2^{1553666515231} is an apocalyptic number.

1553666515231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553666515231 is an equidigital number, since it uses as much as digits as its factorization.

1553666515231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430000, while the sum is 49.

The spelling of 1553666515231 in words is "one trillion, five hundred fifty-three billion, six hundred sixty-six million, five hundred fifteen thousand, two hundred thirty-one".