1820010100155 has 32 divisors (see below), whose sum is σ = 3136340149824. Its totient is φ = 895912759296.

The previous prime is 1820010100133. The next prime is 1820010100157. The reversal of 1820010100155 is 5510010100281.

It is not a de Polignac number, because 1820010100155 - 2⁵ = 1820010100123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1820010100157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1438947 + ... + 2389683.

It is an arithmetic number, because the mean of its divisors is an integer number (98010629682).

Almost surely, 2^{1820010100155} is an apocalyptic number.

1820010100155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1820010100155 is a deficient number, since it is larger than the sum of its proper divisors (1316330049669).

1820010100155 is a wasteful number, since it uses less digits than its factorization.

1820010100155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960575.

The product of its (nonzero) digits is 400, while the sum is 24.

The spelling of 1820010100155 in words is "one trillion, eight hundred twenty billion, ten million, one hundred thousand, one hundred fifty-five".