26404210642 has 4 divisors (see below), whose sum is σ = 39606315966. Its totient is φ = 13202105320.

The previous prime is 26404210639. The next prime is 26404210649. The reversal of 26404210642 is 24601240462.

It is a happy number.

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., 26393576521 + 10634121 = 162461^2 + 3261^2 .

It is not an unprimeable number, because it can be changed into a prime (26404210649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6601052659 + ... + 6601052662.

Almost surely, 2^26404210642 is an apocalyptic number.

26404210642 is a deficient number, since it is larger than the sum of its proper divisors (13202105324).

26404210642 is a wasteful number, since it uses less digits than its factorization.

26404210642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13202105323.

The product of its (nonzero) digits is 18432, while the sum is 31.

The spelling of 26404210642 in words is "twenty-six billion, four hundred four million, two hundred ten thousand, six hundred forty-two".