616138821243 has 24 divisors (see below), whose sum is σ = 970995398256. Its totient is φ = 373375166400.

The previous prime is 616138821229. The next prime is 616138821251. The reversal of 616138821243 is 342128831616.

616138821243 is a `hidden beast` number, since 6 + 1 + 6 + 1 + 388 + 21 + 243 = 666.

It is not a de Polignac number, because 616138821243 - 2¹³ = 616138813051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (616138821643) 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, 537121 + ... + 1233197.

It is an arithmetic number, because the mean of its divisors is an integer number (40458141594).

Almost surely, 2^616138821243 is an apocalyptic number.

616138821243 is a deficient number, since it is larger than the sum of its proper divisors (354856577013).

616138821243 is a wasteful number, since it uses less digits than its factorization.

616138821243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705035 (or 705032 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 616138821243 in words is "six hundred sixteen billion, one hundred thirty-eight million, eight hundred twenty-one thousand, two hundred forty-three".