26420640731 has 2 divisors, whose sum is σ = 26420640732. Its totient is φ = 26420640730.

The previous prime is 26420640721. The next prime is 26420640739. The reversal of 26420640731 is 13704602462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26420640731 - 2⁶ = 26420640667 is a prime.

It is a super-2 number, since 2×26420640731² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26420640691 and 26420640700.

It is not a weakly prime, because it can be changed into another prime (26420640739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13210320365 + 13210320366.

It is an arithmetic number, because the mean of its divisors is an integer number (13210320366).

Almost surely, 2^26420640731 is an apocalyptic number.

26420640731 is a deficient number, since it is larger than the sum of its proper divisors (1).

26420640731 is an equidigital number, since it uses as much as digits as its factorization.

26420640731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 26420640731 in words is "twenty-six billion, four hundred twenty million, six hundred forty thousand, seven hundred thirty-one".