142218156861 has 48 divisors (see below), whose sum is σ = 244163436480. Its totient is φ = 81122607360.

The previous prime is 142218156823. The next prime is 142218156917. The reversal of 142218156861 is 168651812241.

142218156861 is a `hidden beast` number, since 1 + 4 + 2 + 2 + 1 + 81 + 568 + 6 + 1 = 666.

It is not a de Polignac number, because 142218156861 - 2⁷ = 142218156733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142218156811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 742626 + ... + 914291.

It is an arithmetic number, because the mean of its divisors is an integer number (5086738260).

Almost surely, 2^142218156861 is an apocalyptic number.

142218156861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142218156861 is a deficient number, since it is larger than the sum of its proper divisors (101945279619).

142218156861 is a wasteful number, since it uses less digits than its factorization.

142218156861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656971 (or 1656948 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 142218156861 in words is "one hundred forty-two billion, two hundred eighteen million, one hundred fifty-six thousand, eight hundred sixty-one".