61621180830 has 96 divisors (see below), whose sum is σ = 179043123168. Its totient is φ = 14574105600.

The previous prime is 61621180799. The next prime is 61621180847. The reversal of 61621180830 is 3808112616.

61621180830 is a `hidden beast` number, since 616 + 2 + 1 + 1 + 8 + 0 + 8 + 30 = 666.

It is a super-3 number, since 3×61621180830³ (a number of 33 digits) contains 333 as substring.

It is a congruent 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 47 ways as a sum of consecutive naturals, for example, 718479 + ... + 799658.

It is an arithmetic number, because the mean of its divisors is an integer number (1865032533).

Almost surely, 2^61621180830 is an apocalyptic number.

61621180830 is an abundant number, since it is smaller than the sum of its proper divisors (117421942338).

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

61621180830 is a wasteful number, since it uses less digits than its factorization.

61621180830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518202 (or 1518199 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 61621180830 in words is "sixty-one billion, six hundred twenty-one million, one hundred eighty thousand, eight hundred thirty".