26380717157 has 4 divisors (see below), whose sum is σ = 26557769100. Its totient is φ = 26203665216.

The previous prime is 26380717081. The next prime is 26380717159. The reversal of 26380717157 is 75171708362.

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 6084156001 + 20296561156 = 78001^2 + 142466^2 .

It is a cyclic number.

It is not a de Polignac number, because 26380717157 - 2¹² = 26380713061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26380717159) 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, 88525748 + ... + 88526045.

It is an arithmetic number, because the mean of its divisors is an integer number (6639442275).

Almost surely, 2^26380717157 is an apocalyptic number.

It is an amenable number.

26380717157 is a deficient number, since it is larger than the sum of its proper divisors (177051943).

26380717157 is a wasteful number, since it uses less digits than its factorization.

26380717157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177051942.

The product of its (nonzero) digits is 493920, while the sum is 47.

The spelling of 26380717157 in words is "twenty-six billion, three hundred eighty million, seven hundred seventeen thousand, one hundred fifty-seven".