26403416621 has 4 divisors (see below), whose sum is σ = 26650177632. Its totient is φ = 26156655612.

The previous prime is 26403416617. The next prime is 26403416629. The reversal of 26403416621 is 12661430462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26403416621 - 2² = 26403416617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26403416629) 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, 123380345 + ... + 123380558.

It is an arithmetic number, because the mean of its divisors is an integer number (6662544408).

Almost surely, 2^26403416621 is an apocalyptic number.

It is an amenable number.

26403416621 is a deficient number, since it is larger than the sum of its proper divisors (246761011).

26403416621 is a wasteful number, since it uses less digits than its factorization.

26403416621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246761010.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 26403416621 in words is "twenty-six billion, four hundred three million, four hundred sixteen thousand, six hundred twenty-one".