42004166251 has 4 divisors (see below), whose sum is σ = 42005077912. Its totient is φ = 42003254592.

The previous prime is 42004166227. The next prime is 42004166279. The reversal of 42004166251 is 15266140024.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42004166251 - 2⁷ = 42004166123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42004166551) 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, 382821 + ... + 480166.

It is an arithmetic number, because the mean of its divisors is an integer number (10501269478).

Almost surely, 2^42004166251 is an apocalyptic number.

42004166251 is a deficient number, since it is larger than the sum of its proper divisors (911661).

42004166251 is an equidigital number, since it uses as much as digits as its factorization.

42004166251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911660.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 42004166251 in words is "forty-two billion, four million, one hundred sixty-six thousand, two hundred fifty-one".