601660021644 has 36 divisors (see below), whose sum is σ = 1659123091080. Its totient is φ = 182321218560.

The previous prime is 601660021561. The next prime is 601660021657. The reversal of 601660021644 is 446120066106.

601660021644 is a `hidden beast` number, since 6 + 0 + 1 + 6 + 6 + 0 + 0 + 2 + 1 + 644 = 666.

601660021644 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 601660021599 and 601660021608.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 759671349 + ... + 759672140.

It is an arithmetic number, because the mean of its divisors is an integer number (46086752530).

Almost surely, 2^601660021644 is an apocalyptic number.

It is an amenable number.

601660021644 is an abundant number, since it is smaller than the sum of its proper divisors (1057463069436).

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

601660021644 is a wasteful number, since it uses less digits than its factorization.

601660021644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519343510 (or 1519343505 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 601660021644 in words is "six hundred one billion, six hundred sixty million, twenty-one thousand, six hundred forty-four".