26431541649 has 160 divisors (see below), whose sum is σ = 45025009920. Its totient is φ = 15371845632.

The previous prime is 26431541641. The next prime is 26431541671. The reversal of 26431541649 is 94614513462.

26431541649 is a `hidden beast` number, since 2 + 6 + 43 + 1 + 541 + 64 + 9 = 666.

It is not a de Polignac number, because 26431541649 - 2³ = 26431541641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26431541641) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 136950897 + ... + 136951089.

It is an arithmetic number, because the mean of its divisors is an integer number (281406312).

Almost surely, 2^26431541649 is an apocalyptic number.

It is an amenable number.

26431541649 is a deficient number, since it is larger than the sum of its proper divisors (18593468271).

26431541649 is a wasteful number, since it uses less digits than its factorization.

26431541649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 364 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 26431541649 in words is "twenty-six billion, four hundred thirty-one million, five hundred forty-one thousand, six hundred forty-nine".