1554352612721 has 2 divisors, whose sum is σ = 1554352612722. Its totient is φ = 1554352612720.

The previous prime is 1554352612609. The next prime is 1554352612739. The reversal of 1554352612721 is 1272162534551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931010782321 + 623341830400 = 964889^2 + 789520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1554352612721 is a prime.

It is a super-2 number, since 2×1554352612721² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1554352612751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777176306360 + 777176306361.

It is an arithmetic number, because the mean of its divisors is an integer number (777176306361).

Almost surely, 2^{1554352612721} is an apocalyptic number.

It is an amenable number.

1554352612721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554352612721 is an equidigital number, since it uses as much as digits as its factorization.

1554352612721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 44.

The spelling of 1554352612721 in words is "one trillion, five hundred fifty-four billion, three hundred fifty-two million, six hundred twelve thousand, seven hundred twenty-one".