1811802057 has 32 divisors (see below), whose sum is σ = 2832950400. Its totient is φ = 1019837952.

The previous prime is 1811802043. The next prime is 1811802061. The reversal of 1811802057 is 7502081181.

It is not a de Polignac number, because 1811802057 - 2⁶ = 1811801993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1811802017) 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, 20668 + ... + 63645.

It is an arithmetic number, because the mean of its divisors is an integer number (88529700).

Almost surely, 2^1811802057 is an apocalyptic number.

It is an amenable number.

1811802057 is a deficient number, since it is larger than the sum of its proper divisors (1021148343).

1811802057 is a wasteful number, since it uses less digits than its factorization.

1811802057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84377.

The product of its (nonzero) digits is 4480, while the sum is 33.

The square root of 1811802057 is about 42565.2682007291. The cubic root of 1811802057 is about 1219.0932205308.

The spelling of 1811802057 in words is "one billion, eight hundred eleven million, eight hundred two thousand, fifty-seven".