26420640437 has 4 divisors (see below), whose sum is σ = 27811200480. Its totient is φ = 25030080396.

The previous prime is 26420640341. The next prime is 26420640517. The reversal of 26420640437 is 73404602462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26420640437 - 2²⁴ = 26403863221 is a prime.

It is a super-2 number, since 2×26420640437² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26420640437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26420630437) 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, 695279993 + ... + 695280030.

It is an arithmetic number, because the mean of its divisors is an integer number (6952800120).

Almost surely, 2^26420640437 is an apocalyptic number.

It is an amenable number.

26420640437 is a deficient number, since it is larger than the sum of its proper divisors (1390560043).

26420640437 is a wasteful number, since it uses less digits than its factorization.

26420640437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390560042.

The product of its (nonzero) digits is 193536, while the sum is 38.

The spelling of 26420640437 in words is "twenty-six billion, four hundred twenty million, six hundred forty thousand, four hundred thirty-seven".