61550015212 has 12 divisors (see below), whose sum is σ = 123100030480. Its totient is φ = 26378577936.

The previous prime is 61550015201. The next prime is 61550015231. The reversal of 61550015212 is 21251005516.

61550015212 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 2198214829 = 61550015212 / (6 + 1 + 5 + 5 + 0 + 0 + 1 + 5 + 2 + 1 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099107387 + ... + 1099107442.

Almost surely, 2^61550015212 is an apocalyptic number.

It is an amenable number.

61550015212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61550015212 is a wasteful number, since it uses less digits than its factorization.

61550015212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198214840 (or 2198214838 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 61550015212 in words is "sixty-one billion, five hundred fifty million, fifteen thousand, two hundred twelve".