61380128553 has 16 divisors (see below), whose sum is σ = 84688521600. Its totient is φ = 39496786560.

The previous prime is 61380128533. The next prime is 61380128561. The reversal of 61380128553 is 35582108316.

61380128553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61380128553 - 2⁶ = 61380128489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61380128533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176733 + ... + 392421.

It is an arithmetic number, because the mean of its divisors is an integer number (5293032600).

Almost surely, 2^61380128553 is an apocalyptic number.

It is an amenable number.

61380128553 is a deficient number, since it is larger than the sum of its proper divisors (23308393047).

61380128553 is a wasteful number, since it uses less digits than its factorization.

61380128553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218992.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 61380128553 in words is "sixty-one billion, three hundred eighty million, one hundred twenty-eight thousand, five hundred fifty-three".