42660251 has 4 divisors (see below), whose sum is σ = 43244712. Its totient is φ = 42075792.

The previous prime is 42660229. The next prime is 42660271. The reversal of 42660251 is 15206624.

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 42660251 - 2¹⁸ = 42398107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42660251.

It is not an unprimeable number, because it can be changed into a prime (42660271) 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, 292121 + ... + 292266.

It is an arithmetic number, because the mean of its divisors is an integer number (10811178).

Almost surely, 2^42660251 is an apocalyptic number.

42660251 is a deficient number, since it is larger than the sum of its proper divisors (584461).

42660251 is an equidigital number, since it uses as much as digits as its factorization.

42660251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584460.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 42660251 is about 6531.4815317813. The cubic root of 42660251 is about 349.4146706382.

Adding to 42660251 its reverse (15206624), we get a palindrome (57866875).

The spelling of 42660251 in words is "forty-two million, six hundred sixty thousand, two hundred fifty-one".