61389920125 has 24 divisors (see below), whose sum is σ = 78505952616. Its totient is φ = 47900240000.

The previous prime is 61389920089. The next prime is 61389920129. The reversal of 61389920125 is 52102998316.

It can be written as a sum of positive squares in 12 ways, for example, as 61318635876 + 71284249 = 247626^2 + 8443^2 .

It is not a de Polignac number, because 61389920125 - 2²¹ = 61387822973 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 (61389920129) 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, 17735895 + ... + 17739355.

It is an arithmetic number, because the mean of its divisors is an integer number (3271081359).

Almost surely, 2^61389920125 is an apocalyptic number.

It is an amenable number.

61389920125 is a deficient number, since it is larger than the sum of its proper divisors (17116032491).

61389920125 is an frugal number, since it uses more digits than its factorization.

61389920125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6978 (or 3507 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 61389920125 in words is "sixty-one billion, three hundred eighty-nine million, nine hundred twenty thousand, one hundred twenty-five".