61489575389 has 12 divisors (see below), whose sum is σ = 67594419228. Its totient is φ = 55894069440.

The previous prime is 61489575361. The next prime is 61489575397. The reversal of 61489575389 is 98357598416.

61489575389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 48627747289 + 12861828100 = 220517^2 + 113410^2 .

It is not a de Polignac number, because 61489575389 - 2²⁸ = 61221139933 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 (61489575349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1667657 + ... + 1704129.

It is an arithmetic number, because the mean of its divisors is an integer number (5632868269).

Almost surely, 2^61489575389 is an apocalyptic number.

It is an amenable number.

61489575389 is a deficient number, since it is larger than the sum of its proper divisors (6104843839).

61489575389 is a wasteful number, since it uses less digits than its factorization.

61489575389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50428 (or 50417 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 65.

The spelling of 61489575389 in words is "sixty-one billion, four hundred eighty-nine million, five hundred seventy-five thousand, three hundred eighty-nine".