1866842811 has 12 divisors (see below), whose sum is σ = 2855171592. Its totient is φ = 1171352256.

The previous prime is 1866842767. The next prime is 1866842819. The reversal of 1866842811 is 1182486681.

It is not a de Polignac number, because 1866842811 - 2¹⁰ = 1866841787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1866842819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6100641 + ... + 6100946.

It is an arithmetic number, because the mean of its divisors is an integer number (237930966).

Almost surely, 2^1866842811 is an apocalyptic number.

1866842811 is a deficient number, since it is larger than the sum of its proper divisors (988328781).

1866842811 is a wasteful number, since it uses less digits than its factorization.

1866842811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12201610 (or 12201607 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 1866842811 is about 43206.9764158521. The cubic root of 1866842811 is about 1231.3152280765.

The spelling of 1866842811 in words is "one billion, eight hundred sixty-six million, eight hundred forty-two thousand, eight hundred eleven".