26985198721553 has 4 divisors (see below), whose sum is σ = 26985262716468. Its totient is φ = 26985134726640.

The previous prime is 26985198721517. The next prime is 26985198721567. The reversal of 26985198721553 is 35512789158962.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7352297326144 + 19632901395409 = 2711512^2 + 4430903^2 .

It is a cyclic number.

It is not a de Polignac number, because 26985198721553 - 2¹² = 26985198717457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26985198021553) 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, 31360718 + ... + 32209703.

It is an arithmetic number, because the mean of its divisors is an integer number (6746315679117).

Almost surely, 2^{26985198721553} is an apocalyptic number.

It is an amenable number.

26985198721553 is a deficient number, since it is larger than the sum of its proper divisors (63994915).

26985198721553 is an equidigital number, since it uses as much as digits as its factorization.

26985198721553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63994914.

The product of its digits is 326592000, while the sum is 71.

The spelling of 26985198721553 in words is "twenty-six trillion, nine hundred eighty-five billion, one hundred ninety-eight million, seven hundred twenty-one thousand, five hundred fifty-three".