26691881550 has 24 divisors (see below), whose sum is σ = 66195866616. Its totient is φ = 7117835040.

The previous prime is 26691881537. The next prime is 26691881591. The reversal of 26691881550 is 5518819662.

It is a junction number, because it is equal to n+sod(n) for n = 26691881493 and 26691881502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88972789 + ... + 88973088.

It is an arithmetic number, because the mean of its divisors is an integer number (2758161109).

Almost surely, 2^26691881550 is an apocalyptic number.

26691881550 is an abundant number, since it is smaller than the sum of its proper divisors (39503985066).

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

26691881550 is a wasteful number, since it uses less digits than its factorization.

26691881550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177945892 (or 177945887 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 51.

The spelling of 26691881550 in words is "twenty-six billion, six hundred ninety-one million, eight hundred eighty-one thousand, five hundred fifty".