61634563212 has 24 divisors (see below), whose sum is σ = 143828548416. Its totient is φ = 20542773328.

The previous prime is 61634563187. The next prime is 61634563229. The reversal of 61634563212 is 21236543616.

61634563212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134298 + ... + 375905.

It is an arithmetic number, because the mean of its divisors is an integer number (5992856184).

Almost surely, 2^61634563212 is an apocalyptic number.

It is an amenable number.

61634563212 is an abundant number, since it is smaller than the sum of its proper divisors (82193985204).

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

61634563212 is a wasteful number, since it uses less digits than its factorization.

61634563212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520277 (or 520275 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The spelling of 61634563212 in words is "sixty-one billion, six hundred thirty-four million, five hundred sixty-three thousand, two hundred twelve".