137520394679 has 4 divisors (see below), whose sum is σ = 139404235776. Its totient is φ = 135636553584.

The previous prime is 137520394603. The next prime is 137520394691. The reversal of 137520394679 is 976493025731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137520394679 - 2⁸ = 137520394423 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 (137520394379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941920439 + ... + 941920584.

It is an arithmetic number, because the mean of its divisors is an integer number (34851058944).

Almost surely, 2^137520394679 is an apocalyptic number.

137520394679 is a deficient number, since it is larger than the sum of its proper divisors (1883841097).

137520394679 is an equidigital number, since it uses as much as digits as its factorization.

137520394679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883841096.

The product of its (nonzero) digits is 8573040, while the sum is 56.

The spelling of 137520394679 in words is "one hundred thirty-seven billion, five hundred twenty million, three hundred ninety-four thousand, six hundred seventy-nine".