61212004640 has 24 divisors (see below), whose sum is σ = 144613361340. Its totient is φ = 24484801792.

The previous prime is 61212004631. The next prime is 61212004657. The reversal of 61212004640 is 4640021216.

It can be written as a sum of positive squares in 2 ways, for example, as 60077931664 + 1134072976 = 245108^2 + 33676^2 .

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, 191287355 + ... + 191287674.

Almost surely, 2^61212004640 is an apocalyptic number.

It is an amenable number.

61212004640 is an abundant number, since it is smaller than the sum of its proper divisors (83401356700).

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

61212004640 is a wasteful number, since it uses less digits than its factorization.

61212004640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382575044 (or 382575036 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 61212004640 its reverse (4640021216), we get a palindrome (65852025856).

The spelling of 61212004640 in words is "sixty-one billion, two hundred twelve million, four thousand, six hundred forty".