1551561150001 has 4 divisors (see below), whose sum is σ = 1556518214692. Its totient is φ = 1546604085312.

The previous prime is 1551561149993. The next prime is 1551561150019. The reversal of 1551561150001 is 1000511651551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240080400400 + 1311480749601 = 489980^2 + 1145199^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551561150001 - 2³ = 1551561149993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551561550001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478531876 + ... + 2478532501.

It is an arithmetic number, because the mean of its divisors is an integer number (389129553673).

Almost surely, 2^{1551561150001} is an apocalyptic number.

It is an amenable number.

1551561150001 is a deficient number, since it is larger than the sum of its proper divisors (4957064691).

1551561150001 is an equidigital number, since it uses as much as digits as its factorization.

1551561150001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957064690.

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 1551561150001 in words is "one trillion, five hundred fifty-one billion, five hundred sixty-one million, one hundred fifty thousand, one".