1550515401557 has 2 divisors, whose sum is σ = 1550515401558. Its totient is φ = 1550515401556.

The previous prime is 1550515401521. The next prime is 1550515401563. The reversal of 1550515401557 is 7551045150551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1442979940081 + 107535461476 = 1201241^2 + 327926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550515401557 - 2³⁴ = 1533335532373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550515407557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775257700778 + 775257700779.

It is an arithmetic number, because the mean of its divisors is an integer number (775257700779).

Almost surely, 2^{1550515401557} is an apocalyptic number.

It is an amenable number.

1550515401557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550515401557 is an equidigital number, since it uses as much as digits as its factorization.

1550515401557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437500, while the sum is 44.

The spelling of 1550515401557 in words is "one trillion, five hundred fifty billion, five hundred fifteen million, four hundred one thousand, five hundred fifty-seven".