660802026780 has 192 divisors, whose sum is σ = 2350123776000. Its totient is φ = 151001542656.

The previous prime is 660802026767. The next prime is 660802026809. The reversal of 660802026780 is 87620208066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16192041 + ... + 16232799.

It is an arithmetic number, because the mean of its divisors is an integer number (12240228000).

Almost surely, 2^660802026780 is an apocalyptic number.

660802026780 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 660802026780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175061888000).

660802026780 is an abundant number, since it is smaller than the sum of its proper divisors (1689321749220).

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

660802026780 is a wasteful number, since it uses less digits than its factorization.

660802026780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45073 (or 45065 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 660802026780 in words is "six hundred sixty billion, eight hundred two million, twenty-six thousand, seven hundred eighty".