142666621 has 4 divisors (see below), whose sum is σ = 143078112. Its totient is φ = 142255132.

The previous prime is 142666613. The next prime is 142666637. The reversal of 142666621 is 126666241.

142666621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142666621 - 2³ = 142666613 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 (142666691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205225 + ... + 205918.

It is an arithmetic number, because the mean of its divisors is an integer number (35769528).

Almost surely, 2^142666621 is an apocalyptic number.

It is an amenable number.

142666621 is a deficient number, since it is larger than the sum of its proper divisors (411491).

142666621 is an equidigital number, since it uses as much as digits as its factorization.

142666621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411490.

The product of its digits is 20736, while the sum is 34.

The square root of 142666621 is about 11944.3133331305. The cubic root of 142666621 is about 522.5254626145.

The spelling of 142666621 in words is "one hundred forty-two million, six hundred sixty-six thousand, six hundred twenty-one".