61666664222304 has 192 divisors, whose sum is σ = 182121270912000. Its totient is φ = 20298324211200.

The previous prime is 61666664222269. The next prime is 61666664222377. The reversal of 61666664222304 is 40322246666616.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32140777 + ... + 34005335.

It is an arithmetic number, because the mean of its divisors is an integer number (948548286000).

Almost surely, 2^{61666664222304} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61666664222304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91060635456000).

61666664222304 is an abundant number, since it is smaller than the sum of its proper divisors (120454606689696).

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

61666664222304 is a wasteful number, since it uses less digits than its factorization.

61666664222304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865058 (or 1865044 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 54.

The spelling of 61666664222304 in words is "sixty-one trillion, six hundred sixty-six billion, six hundred sixty-four million, two hundred twenty-two thousand, three hundred four".