26421153661 has 8 divisors (see below), whose sum is σ = 30302304704. Its totient is φ = 22566677760.

The previous prime is 26421153641. The next prime is 26421153677. The reversal of 26421153661 is 16635112462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26421153661 - 2⁹ = 26421153149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26421153661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26421153601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6666660 + ... + 6670621.

It is an arithmetic number, because the mean of its divisors is an integer number (3787788088).

Almost surely, 2^26421153661 is an apocalyptic number.

It is an amenable number.

26421153661 is a deficient number, since it is larger than the sum of its proper divisors (3881151043).

26421153661 is a wasteful number, since it uses less digits than its factorization.

26421153661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337571.

The product of its digits is 51840, while the sum is 37.

The spelling of 26421153661 in words is "twenty-six billion, four hundred twenty-one million, one hundred fifty-three thousand, six hundred sixty-one".