42587978721 has 4 divisors (see below), whose sum is σ = 56783971632. Its totient is φ = 28391985812.

The previous prime is 42587978711. The next prime is 42587978743. The reversal of 42587978721 is 12787978524.

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 42587978721 - 2⁷ = 42587978593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42587978711) 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, 7097996451 + ... + 7097996456.

It is an arithmetic number, because the mean of its divisors is an integer number (14195992908).

Almost surely, 2^42587978721 is an apocalyptic number.

It is an amenable number.

42587978721 is a deficient number, since it is larger than the sum of its proper divisors (14195992911).

42587978721 is a wasteful number, since it uses less digits than its factorization.

42587978721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14195992910.

The product of its digits is 15805440, while the sum is 60.

The spelling of 42587978721 in words is "forty-two billion, five hundred eighty-seven million, nine hundred seventy-eight thousand, seven hundred twenty-one".