1020555251555 has 12 divisors (see below), whose sum is σ = 1424611820880. Its totient is φ = 699809315184.

The previous prime is 1020555251543. The next prime is 1020555251561. The reversal of 1020555251555 is 5551525550201.

It is not a de Polignac number, because 1020555251555 - 2²⁸ = 1020286816099 is a prime.

It is a super-3 number, since 3×1020555251555³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2082765575 + ... + 2082766064.

It is an arithmetic number, because the mean of its divisors is an integer number (118717651740).

Almost surely, 2^{1020555251555} is an apocalyptic number.

1020555251555 is a deficient number, since it is larger than the sum of its proper divisors (404056569325).

1020555251555 is an equidigital number, since it uses as much as digits as its factorization.

1020555251555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4165531658 (or 4165531651 counting only the distinct ones).

The product of its (nonzero) digits is 312500, while the sum is 41.

The spelling of 1020555251555 in words is "one trillion, twenty billion, five hundred fifty-five million, two hundred fifty-one thousand, five hundred fifty-five".