26142721127561 has 8 divisors (see below), whose sum is σ = 26485760950344. Its totient is φ = 25801887349120.

The previous prime is 26142721127503. The next prime is 26142721127609. The reversal of 26142721127561 is 16572112724162.

It can be written as a sum of positive squares in 4 ways, for example, as 16102916968336 + 10039804159225 = 4012844^2 + 3168565^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26142721127561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26142721177561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551487230 + ... + 551534631.

It is an arithmetic number, because the mean of its divisors is an integer number (3310720118793).

Almost surely, 2^{26142721127561} is an apocalyptic number.

It is an amenable number.

26142721127561 is a deficient number, since it is larger than the sum of its proper divisors (343039822783).

26142721127561 is a wasteful number, since it uses less digits than its factorization.

26142721127561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103022171.

The product of its digits is 564480, while the sum is 47.

The spelling of 26142721127561 in words is "twenty-six trillion, one hundred forty-two billion, seven hundred twenty-one million, one hundred twenty-seven thousand, five hundred sixty-one".