61505005556 has 12 divisors (see below), whose sum is σ = 107763915168. Its totient is φ = 30715315512.

The previous prime is 61505005531. The next prime is 61505005561. The reversal of 61505005556 is 65550050516.

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, 9293096 + ... + 9299711.

It is an arithmetic number, because the mean of its divisors is an integer number (8980326264).

Almost surely, 2^61505005556 is an apocalyptic number.

It is an amenable number.

61505005556 is a deficient number, since it is larger than the sum of its proper divisors (46258909612).

61505005556 is a wasteful number, since it uses less digits than its factorization.

61505005556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18593638 (or 18593636 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The spelling of 61505005556 in words is "sixty-one billion, five hundred five million, five thousand, five hundred fifty-six".