42664261826 has 4 divisors (see below), whose sum is σ = 63996392742. Its totient is φ = 21332130912.

The previous prime is 42664261811. The next prime is 42664261831. The reversal of 42664261826 is 62816246624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29687634601 + 12976627225 = 172301^2 + 113915^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666065455 + ... + 10666065458.

Almost surely, 2^42664261826 is an apocalyptic number.

42664261826 is a deficient number, since it is larger than the sum of its proper divisors (21332130916).

42664261826 is a wasteful number, since it uses less digits than its factorization.

42664261826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21332130915.

The product of its digits is 1327104, while the sum is 47.

The spelling of 42664261826 in words is "forty-two billion, six hundred sixty-four million, two hundred sixty-one thousand, eight hundred twenty-six".