1866142420790 has 16 divisors (see below), whose sum is σ = 3364959805920. Its totient is φ = 745145090880.

The previous prime is 1866142420781. The next prime is 1866142420799. The reversal of 1866142420790 is 970242416681.

It is an interprime number because it is at equal distance from previous prime (1866142420781) and next prime (1866142420799).

It is a super-2 number, since 2×1866142420790² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866142420799) 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 7 ways as a sum of consecutive naturals, for example, 163978706 + ... + 163990085.

It is an arithmetic number, because the mean of its divisors is an integer number (210309987870).

Almost surely, 2^{1866142420790} is an apocalyptic number.

1866142420790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1866142420790 is a deficient number, since it is larger than the sum of its proper divisors (1498817385130).

1866142420790 is a wasteful number, since it uses less digits than its factorization.

1866142420790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327969367.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 1866142420790 in words is "one trillion, eight hundred sixty-six billion, one hundred forty-two million, four hundred twenty thousand, seven hundred ninety".