26391953540 has 24 divisors (see below), whose sum is σ = 57210945792. Its totient is φ = 10216239840.

The previous prime is 26391953521. The next prime is 26391953551. The reversal of 26391953540 is 4535919362.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21283214 + ... + 21284453.

It is an arithmetic number, because the mean of its divisors is an integer number (2383789408).

Almost surely, 2^26391953540 is an apocalyptic number.

26391953540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26391953540 is an abundant number, since it is smaller than the sum of its proper divisors (30818992252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26391953540 is a wasteful number, since it uses less digits than its factorization.

26391953540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42567707 (or 42567705 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 47.

The spelling of 26391953540 in words is "twenty-six billion, three hundred ninety-one million, nine hundred fifty-three thousand, five hundred forty".