26551857565787 has 4 divisors (see below), whose sum is σ = 27949323753480. Its totient is φ = 25154391378096.

The previous prime is 26551857565747. The next prime is 26551857565819. The reversal of 26551857565787 is 78756575815562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26551857565787 - 2¹⁰ = 26551857564763 is a prime.

It is a super-2 number, since 2×26551857565787² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26551857565747) 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, 698733093818 + ... + 698733093855.

It is an arithmetic number, because the mean of its divisors is an integer number (6987330938370).

Almost surely, 2^{26551857565787} is an apocalyptic number.

26551857565787 is a deficient number, since it is larger than the sum of its proper divisors (1397466187693).

26551857565787 is a wasteful number, since it uses less digits than its factorization.

26551857565787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397466187692.

The product of its digits is 4939200000, while the sum is 77.

The spelling of 26551857565787 in words is "twenty-six trillion, five hundred fifty-one billion, eight hundred fifty-seven million, five hundred sixty-five thousand, seven hundred eighty-seven".