662666735520 has 144 divisors (see below), whose sum is σ = 2265693203592. Its totient is φ = 176371752960.

The previous prime is 662666735503. The next prime is 662666735537. The reversal of 662666735520 is 25537666266.

It is an interprime number because it is at equal distance from previous prime (662666735503) and next prime (662666735537).

It can be written as a sum of positive squares in 4 ways, for example, as 549988358544 + 112678376976 = 741612^2 + 335676^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308604 + ... + 1191876.

Almost surely, 2^662666735520 is an apocalyptic number.

662666735520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 662666735520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132846601796).

662666735520 is an abundant number, since it is smaller than the sum of its proper divisors (1603026468072).

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

662666735520 is a wasteful number, since it uses less digits than its factorization.

662666735520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883815 (or 883804 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 662666735520 in words is "six hundred sixty-two billion, six hundred sixty-six million, seven hundred thirty-five thousand, five hundred twenty".