26742712661578 has 4 divisors (see below), whose sum is σ = 40114068992370. Its totient is φ = 13371356330788.

The previous prime is 26742712661551. The next prime is 26742712661579. The reversal of 26742712661578 is 87516621724762.

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

It can be written as a sum of positive squares in only one way, i.e., 25128534788569 + 1614177873009 = 5012837^2 + 1270503^2 .

It is not an unprimeable number, because it can be changed into a prime (26742712661579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6685678165393 + ... + 6685678165396.

Almost surely, 2^{26742712661578} is an apocalyptic number.

26742712661578 is a deficient number, since it is larger than the sum of its proper divisors (13371356330792).

26742712661578 is a wasteful number, since it uses less digits than its factorization.

26742712661578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13371356330791.

The product of its digits is 94832640, while the sum is 64.

The spelling of 26742712661578 in words is "twenty-six trillion, seven hundred forty-two billion, seven hundred twelve million, six hundred sixty-one thousand, five hundred seventy-eight".