1002155131555 has 16 divisors (see below), whose sum is σ = 1209746410560. Its totient is φ = 796956991488.

The previous prime is 1002155131519. The next prime is 1002155131597. The reversal of 1002155131555 is 5551315512001.

It is a cyclic number.

It is not a de Polignac number, because 1002155131555 - 2³³ = 993565196963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002155131555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858891 + ... + 1655899.

It is an arithmetic number, because the mean of its divisors is an integer number (75609150660).

Almost surely, 2^{1002155131555} is an apocalyptic number.

1002155131555 is a deficient number, since it is larger than the sum of its proper divisors (207591279005).

1002155131555 is a wasteful number, since it uses less digits than its factorization.

1002155131555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798510.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 1002155131555 in words is "one trillion, two billion, one hundred fifty-five million, one hundred thirty-one thousand, five hundred fifty-five".