26642973893 has 2 divisors, whose sum is σ = 26642973894. Its totient is φ = 26642973892.

The previous prime is 26642973823. The next prime is 26642973923. The reversal of 26642973893 is 39837924662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22427458564 + 4215515329 = 149758^2 + 64927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26642973893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26642973823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13321486946 + 13321486947.

It is an arithmetic number, because the mean of its divisors is an integer number (13321486947).

Almost surely, 2^26642973893 is an apocalyptic number.

It is an amenable number.

26642973893 is a deficient number, since it is larger than the sum of its proper divisors (1).

26642973893 is an equidigital number, since it uses as much as digits as its factorization.

26642973893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 59.

The spelling of 26642973893 in words is "twenty-six billion, six hundred forty-two million, nine hundred seventy-three thousand, eight hundred ninety-three".