1550100500561 has 2 divisors, whose sum is σ = 1550100500562. Its totient is φ = 1550100500560.

The previous prime is 1550100500537. The next prime is 1550100500581. The reversal of 1550100500561 is 1650050010551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1424585473600 + 125515026961 = 1193560^2 + 354281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550100500561 - 2¹⁸ = 1550100238417 is a prime.

It is a super-2 number, since 2×1550100500561² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1550100500581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775050250280 + 775050250281.

It is an arithmetic number, because the mean of its divisors is an integer number (775050250281).

Almost surely, 2^{1550100500561} is an apocalyptic number.

It is an amenable number.

1550100500561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550100500561 is an equidigital number, since it uses as much as digits as its factorization.

1550100500561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 1550100500561 in words is "one trillion, five hundred fifty billion, one hundred million, five hundred thousand, five hundred sixty-one".