147821638549 has 32 divisors (see below), whose sum is σ = 172355339520. Its totient is φ = 125641055232.

The previous prime is 147821638537. The next prime is 147821638597. The reversal of 147821638549 is 945836128741.

It is a cyclic number.

It is not a de Polignac number, because 147821638549 - 2¹⁵ = 147821605781 is a prime.

It is a super-2 number, since 2×147821638549² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 147821638493 and 147821638502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147821638519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2896834 + ... + 2947420.

It is an arithmetic number, because the mean of its divisors is an integer number (5386104360).

Almost surely, 2^147821638549 is an apocalyptic number.

It is an amenable number.

147821638549 is a deficient number, since it is larger than the sum of its proper divisors (24533700971).

147821638549 is a wasteful number, since it uses less digits than its factorization.

147821638549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50989.

The product of its digits is 11612160, while the sum is 58.

The spelling of 147821638549 in words is "one hundred forty-seven billion, eight hundred twenty-one million, six hundred thirty-eight thousand, five hundred forty-nine".