1815272938851 has 16 divisors (see below), whose sum is σ = 2490139304064. Its totient is φ = 1175789127744.

The previous prime is 1815272938783. The next prime is 1815272938939. The reversal of 1815272938851 is 1588392725181.

It is a happy number.

It is not a de Polignac number, because 1815272938851 - 2¹⁰ = 1815272937827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1815272948851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61842921 + ... + 61872266.

It is an arithmetic number, because the mean of its divisors is an integer number (155633706504).

Almost surely, 2^{1815272938851} is an apocalyptic number.

1815272938851 is a deficient number, since it is larger than the sum of its proper divisors (674866365213).

1815272938851 is a wasteful number, since it uses less digits than its factorization.

1815272938851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123715330.

The product of its digits is 9676800, while the sum is 60.

The spelling of 1815272938851 in words is "one trillion, eight hundred fifteen billion, two hundred seventy-two million, nine hundred thirty-eight thousand, eight hundred fifty-one".