26506464621 has 32 divisors (see below), whose sum is σ = 43583473920. Its totient is φ = 13953890304.

The previous prime is 26506464613. The next prime is 26506464629. The reversal of 26506464621 is 12646460562.

It is an interprime number because it is at equal distance from previous prime (26506464613) and next prime (26506464629).

It is not a de Polignac number, because 26506464621 - 2³ = 26506464613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26506464629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43581 + ... + 234333.

It is an arithmetic number, because the mean of its divisors is an integer number (1361983560).

Almost surely, 2^26506464621 is an apocalyptic number.

26506464621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26506464621 is a deficient number, since it is larger than the sum of its proper divisors (17077009299).

26506464621 is a wasteful number, since it uses less digits than its factorization.

26506464621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191285.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 26506464621 in words is "twenty-six billion, five hundred six million, four hundred sixty-four thousand, six hundred twenty-one".