42867778651 has 4 divisors (see below), whose sum is σ = 42873071904. Its totient is φ = 42862485400.

The previous prime is 42867778643. The next prime is 42867778661. The reversal of 42867778651 is 15687776824.

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 42867778651 - 2³ = 42867778643 is a prime.

It is a super-2 number, since 2×42867778651² (a number of 22 digits) contains 22 as substring.

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 42867778651.

It is not an unprimeable number, because it can be changed into a prime (42867778661) 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, 2634460 + ... + 2650681.

It is an arithmetic number, because the mean of its divisors is an integer number (10718267976).

Almost surely, 2^42867778651 is an apocalyptic number.

42867778651 is a deficient number, since it is larger than the sum of its proper divisors (5293253).

42867778651 is an equidigital number, since it uses as much as digits as its factorization.

42867778651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293252.

The product of its digits is 31610880, while the sum is 61.

The spelling of 42867778651 in words is "forty-two billion, eight hundred sixty-seven million, seven hundred seventy-eight thousand, six hundred fifty-one".