42154666 has 4 divisors (see below), whose sum is σ = 63232002. Its totient is φ = 21077332.

The previous prime is 42154649. The next prime is 42154667. The reversal of 42154666 is 66645124.

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

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 13905441 = 5315^2 + 3729^2 .

It is not an unprimeable number, because it can be changed into a prime (42154667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538665 + ... + 10538668.

Almost surely, 2^42154666 is an apocalyptic number.

42154666 is a deficient number, since it is larger than the sum of its proper divisors (21077336).

42154666 is a wasteful number, since it uses less digits than its factorization.

42154666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21077335.

The product of its digits is 34560, while the sum is 34.

The square root of 42154666 is about 6492.6624739008. The cubic root of 42154666 is about 348.0288268277.

The spelling of 42154666 in words is "forty-two million, one hundred fifty-four thousand, six hundred sixty-six".