42878661017 has 4 divisors (see below), whose sum is σ = 42884908416. Its totient is φ = 42872413620.

The previous prime is 42878660963. The next prime is 42878661031. The reversal of 42878661017 is 71016687824.

It is a happy number.

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 42878661017 - 2²⁰ = 42877612441 is a prime.

It is a super-2 number, since 2×42878661017² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42878669017) 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, 3113393 + ... + 3127134.

It is an arithmetic number, because the mean of its divisors is an integer number (10721227104).

Almost surely, 2^42878661017 is an apocalyptic number.

It is an amenable number.

42878661017 is a deficient number, since it is larger than the sum of its proper divisors (6247399).

42878661017 is an equidigital number, since it uses as much as digits as its factorization.

42878661017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247398.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 42878661017 in words is "forty-two billion, eight hundred seventy-eight million, six hundred sixty-one thousand, seventeen".