1820115505151 has 4 divisors (see below), whose sum is σ = 1820791376952. Its totient is φ = 1819439633352.

The previous prime is 1820115505127. The next prime is 1820115505163. The reversal of 1820115505151 is 1515055110281.

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

It is a cyclic number.

It is not a de Polignac number, because 1820115505151 - 2³⁸ = 1545237598207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820115505111) 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, 337931861 + ... + 337937246.

It is an arithmetic number, because the mean of its divisors is an integer number (455197844238).

Almost surely, 2^{1820115505151} is an apocalyptic number.

1820115505151 is a deficient number, since it is larger than the sum of its proper divisors (675871801).

1820115505151 is an equidigital number, since it uses as much as digits as its factorization.

1820115505151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675871800.

The product of its (nonzero) digits is 10000, while the sum is 35.

The spelling of 1820115505151 in words is "one trillion, eight hundred twenty billion, one hundred fifteen million, five hundred five thousand, one hundred fifty-one".