166620456442 has 16 divisors (see below), whose sum is σ = 272858414400. Its totient is φ = 75679138240.

The previous prime is 166620456439. The next prime is 166620456463. The reversal of 166620456442 is 244654026661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 166620456392 and 166620456401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2841967 + ... + 2900002.

It is an arithmetic number, because the mean of its divisors is an integer number (17053650900).

Almost surely, 2^166620456442 is an apocalyptic number.

166620456442 is a deficient number, since it is larger than the sum of its proper divisors (106237957958).

166620456442 is a wasteful number, since it uses less digits than its factorization.

166620456442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5743301.

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 166620456442 in words is "one hundred sixty-six billion, six hundred twenty million, four hundred fifty-six thousand, four hundred forty-two".