61651688580 has 36 divisors (see below), whose sum is σ = 187010122572. Its totient is φ = 16440450240.

The previous prime is 61651688569. The next prime is 61651688597. The reversal of 61651688580 is 8588615616.

61651688580 is a `hidden beast` number, since 6 + 1 + 6 + 51 + 6 + 8 + 8 + 580 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26524682496 + 35127006084 = 162864^2 + 187422^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171254511 + ... + 171254870.

It is an arithmetic number, because the mean of its divisors is an integer number (5194725627).

Almost surely, 2^61651688580 is an apocalyptic number.

61651688580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61651688580 is an abundant number, since it is smaller than the sum of its proper divisors (125358433992).

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

61651688580 is a wasteful number, since it uses less digits than its factorization.

61651688580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342509396 (or 342509391 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 61651688580 in words is "sixty-one billion, six hundred fifty-one million, six hundred eighty-eight thousand, five hundred eighty".