61212012064 has 144 divisors (see below), whose sum is σ = 152055723960. Its totient is φ = 24087920640.

The previous prime is 61212012031. The next prime is 61212012079. The reversal of 61212012064 is 46021021216.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57379411600 + 3832600464 = 239540^2 + 61908^2 .

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, 1064892 + ... + 1120900.

Almost surely, 2^61212012064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61212012064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76027861980).

61212012064 is an abundant number, since it is smaller than the sum of its proper divisors (90843711896).

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

61212012064 is a wasteful number, since it uses less digits than its factorization.

61212012064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56091 (or 56076 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 61212012064 in words is "sixty-one billion, two hundred twelve million, twelve thousand, sixty-four".