61666722750 has 64 divisors (see below), whose sum is σ = 155332457280. Its totient is φ = 16293571200.

The previous prime is 61666722739. The next prime is 61666722779. The reversal of 61666722750 is 5722766616.

It is a self number, because there is not a number n which added to its sum of digits gives 61666722750.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295417 + ... + 458916.

It is an arithmetic number, because the mean of its divisors is an integer number (2427069645).

Almost surely, 2^61666722750 is an apocalyptic number.

61666722750 is an abundant number, since it is smaller than the sum of its proper divisors (93665734530).

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

61666722750 is a wasteful number, since it uses less digits than its factorization.

61666722750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754462 (or 754452 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 61666722750 in words is "sixty-one billion, six hundred sixty-six million, seven hundred twenty-two thousand, seven hundred fifty".