26221995640 has 16 divisors (see below), whose sum is σ = 58999490280. Its totient is φ = 10488798240.

The previous prime is 26221995563. The next prime is 26221995677. The reversal of 26221995640 is 4659912262.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327774906 + ... + 327774985.

Almost surely, 2^26221995640 is an apocalyptic number.

26221995640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26221995640 is an abundant number, since it is smaller than the sum of its proper divisors (32777494640).

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

26221995640 is a wasteful number, since it uses less digits than its factorization.

26221995640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655549902 (or 655549898 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 26221995640 in words is "twenty-six billion, two hundred twenty-one million, nine hundred ninety-five thousand, six hundred forty".