42664877865 has 24 divisors (see below), whose sum is σ = 76502541960. Its totient is φ = 21969959424.

The previous prime is 42664877863. The next prime is 42664877881. The reversal of 42664877865 is 56877846624.

42664877865 is a `hidden beast` number, since 4 + 26 + 6 + 487 + 78 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9281202921 + 33383674944 = 96339^2 + 182712^2 .

It is not a de Polignac number, because 42664877865 - 2¹ = 42664877863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42664877863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16345392 + ... + 16348001.

It is an arithmetic number, because the mean of its divisors is an integer number (3187605915).

Almost surely, 2^42664877865 is an apocalyptic number.

42664877865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42664877865 is a deficient number, since it is larger than the sum of its proper divisors (33837664095).

42664877865 is a wasteful number, since it uses less digits than its factorization.

42664877865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32693433 (or 32693430 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 63.

The spelling of 42664877865 in words is "forty-two billion, six hundred sixty-four million, eight hundred seventy-seven thousand, eight hundred sixty-five".