142644661 has 4 divisors (see below), whose sum is σ = 144247500. Its totient is φ = 141041824.

The previous prime is 142644659. The next prime is 142644727. The reversal of 142644661 is 166446241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55800900 + 86843761 = 7470^2 + 9319^2 .

It is a cyclic number.

It is not a de Polignac number, because 142644661 - 2¹ = 142644659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142644641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801286 + ... + 801463.

It is an arithmetic number, because the mean of its divisors is an integer number (36061875).

Almost surely, 2^142644661 is an apocalyptic number.

It is an amenable number.

142644661 is a deficient number, since it is larger than the sum of its proper divisors (1602839).

142644661 is an equidigital number, since it uses as much as digits as its factorization.

142644661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602838.

The product of its digits is 27648, while the sum is 34.

The square root of 142644661 is about 11943.3940318487. The cubic root of 142644661 is about 522.4986512789.

The spelling of 142644661 in words is "one hundred forty-two million, six hundred forty-four thousand, six hundred sixty-one".