61555815928 has 16 divisors (see below), whose sum is σ = 116325953280. Its totient is φ = 30535561728.

The previous prime is 61555815887. The next prime is 61555815941. The reversal of 61555815928 is 82951855516.

61555815928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30292201 + ... + 30294232.

It is an arithmetic number, because the mean of its divisors is an integer number (7270372080).

Almost surely, 2^61555815928 is an apocalyptic number.

It is an amenable number.

61555815928 is a deficient number, since it is larger than the sum of its proper divisors (54770137352).

61555815928 is a wasteful number, since it uses less digits than its factorization.

61555815928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60586566 (or 60586562 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 55.

The spelling of 61555815928 in words is "sixty-one billion, five hundred fifty-five million, eight hundred fifteen thousand, nine hundred twenty-eight".