61538128350 has 48 divisors (see below), whose sum is σ = 154546417920. Its totient is φ = 16202440800.

The previous prime is 61538128343. The next prime is 61538128369. The reversal of 61538128350 is 5382183516.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2584696 + ... + 2608395.

It is an arithmetic number, because the mean of its divisors is an integer number (3219717040).

Almost surely, 2^61538128350 is an apocalyptic number.

61538128350 is an abundant number, since it is smaller than the sum of its proper divisors (93008289570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61538128350 is a wasteful number, since it uses less digits than its factorization.

61538128350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5193185 (or 5193180 counting only the distinct ones).

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

The spelling of 61538128350 in words is "sixty-one billion, five hundred thirty-eight million, one hundred twenty-eight thousand, three hundred fifty".