664777870848 has 1600 divisors, whose sum is σ = 2626338570240. Its totient is φ = 162533081088.

The previous prime is 664777870819. The next prime is 664777870877. The reversal of 664777870848 is 848078777466.

664777870848 is a `hidden beast` number, since 6 + 6 + 477 + 7 + 8 + 70 + 84 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (664777870819) and next prime (664777870877).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5234471361 + ... + 5234471487.

Almost surely, 2^664777870848 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 664777870848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313169285120).

664777870848 is an abundant number, since it is smaller than the sum of its proper divisors (1961560699392).

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

664777870848 is a wasteful number, since it uses less digits than its factorization.

664777870848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 708083712, while the sum is 72.

The spelling of 664777870848 in words is "six hundred sixty-four billion, seven hundred seventy-seven million, eight hundred seventy thousand, eight hundred forty-eight".