26961613639 has 2 divisors, whose sum is σ = 26961613640. Its totient is φ = 26961613638.

The previous prime is 26961613619. The next prime is 26961613667. The reversal of 26961613639 is 93631616962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26961613639 - 2²⁷ = 26827395911 is a prime.

It is a super-2 number, since 2×26961613639² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26961613619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13480806819 + 13480806820.

It is an arithmetic number, because the mean of its divisors is an integer number (13480806820).

Almost surely, 2^26961613639 is an apocalyptic number.

26961613639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26961613639 is an equidigital number, since it uses as much as digits as its factorization.

26961613639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 52.

The spelling of 26961613639 in words is "twenty-six billion, nine hundred sixty-one million, six hundred thirteen thousand, six hundred thirty-nine".