137920215447 has 24 divisors (see below), whose sum is σ = 227690080800. Its totient is φ = 78807306240.

The previous prime is 137920215401. The next prime is 137920215491. The reversal of 137920215447 is 744512029731.

137920215447 is a `hidden beast` number, since 1 + 379 + 20 + 215 + 4 + 47 = 666.

It is not a de Polignac number, because 137920215447 - 2³² = 133625248151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137920215497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1406679 + ... + 1501527.

It is an arithmetic number, because the mean of its divisors is an integer number (9487086700).

Almost surely, 2^137920215447 is an apocalyptic number.

137920215447 is a deficient number, since it is larger than the sum of its proper divisors (89769865353).

137920215447 is a wasteful number, since it uses less digits than its factorization.

137920215447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117943 (or 117940 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 137920215447 in words is "one hundred thirty-seven billion, nine hundred twenty million, two hundred fifteen thousand, four hundred forty-seven".