1866421711 has 24 divisors (see below), whose sum is σ = 2371496400. Its totient is φ = 1452528000.

The previous prime is 1866421709. The next prime is 1866421741. The reversal of 1866421711 is 1171246681.

It is not a de Polignac number, because 1866421711 - 2¹ = 1866421709 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866421741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 563761 + ... + 567061.

It is an arithmetic number, because the mean of its divisors is an integer number (98812350).

Almost surely, 2^1866421711 is an apocalyptic number.

1866421711 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1866421711 is a deficient number, since it is larger than the sum of its proper divisors (505074689).

1866421711 is a wasteful number, since it uses less digits than its factorization.

1866421711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375 (or 4368 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1866421711 is about 43202.1030853823. The cubic root of 1866421711 is about 1231.2226393432. Note that the first 3 decimals are identical.

The spelling of 1866421711 in words is "one billion, eight hundred sixty-six million, four hundred twenty-one thousand, seven hundred eleven".