61515206250 has 48 divisors (see below), whose sum is σ = 153778220064. Its totient is φ = 16404050000.

The previous prime is 61515206219. The next prime is 61515206293. The reversal of 61515206250 is 5260251516.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 1621656 + ... + 1659155.

It is an arithmetic number, because the mean of its divisors is an integer number (3203712918).

Almost surely, 2^61515206250 is an apocalyptic number.

61515206250 is an abundant number, since it is smaller than the sum of its proper divisors (92263013814).

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

61515206250 is an equidigital number, since it uses as much as digits as its factorization.

61515206250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280841 (or 3280821 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 61515206250 its reverse (5260251516), we get a palindrome (66775457766).

The spelling of 61515206250 in words is "sixty-one billion, five hundred fifteen million, two hundred six thousand, two hundred fifty".