660643104 has 48 divisors (see below), whose sum is σ = 1891844640. Its totient is φ = 200194560.

The previous prime is 660643097. The next prime is 660643117. The reversal of 660643104 is 401346066.

660643104 = T₁₂₁₁₂ + T₁₂₁₁₃ + ... + T₁₂₁₂₀.

It is a tau number, because it is divible by the number of its divisors (48).

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, 311749 + ... + 313860.

It is an arithmetic number, because the mean of its divisors is an integer number (39413430).

Almost surely, 2^660643104 is an apocalyptic number.

It is an amenable number.

660643104 is an abundant number, since it is smaller than the sum of its proper divisors (1231201536).

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

660643104 is a wasteful number, since it uses less digits than its factorization.

660643104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625633 (or 625625 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 660643104 is about 25702.9785044457. The cubic root of 660643104 is about 870.9414672851.

The spelling of 660643104 in words is "six hundred sixty million, six hundred forty-three thousand, one hundred four".