1251055533355 has 4 divisors (see below), whose sum is σ = 1501266640032. Its totient is φ = 1000844426680.

The previous prime is 1251055533293. The next prime is 1251055533359. The reversal of 1251055533355 is 5533355501521.

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

It is not a de Polignac number, because 1251055533355 - 2⁹ = 1251055532843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251055533359) 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, 125105553331 + ... + 125105553340.

It is an arithmetic number, because the mean of its divisors is an integer number (375316660008).

Almost surely, 2^{1251055533355} is an apocalyptic number.

1251055533355 is a deficient number, since it is larger than the sum of its proper divisors (250211106677).

1251055533355 is an equidigital number, since it uses as much as digits as its factorization.

1251055533355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250211106676.

The product of its (nonzero) digits is 843750, while the sum is 43.

The spelling of 1251055533355 in words is "one trillion, two hundred fifty-one billion, fifty-five million, five hundred thirty-three thousand, three hundred fifty-five".