661064302080 has 1600 divisors, whose sum is σ = 2973596427648. Its totient is φ = 136638627840.

The previous prime is 661064302051. The next prime is 661064302091. The reversal of 661064302080 is 80203460166.

661064302080 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 643 + 0 + 2 + 0 + 8 + 0 = 666.

It is a super-2 number, since 2×661064302080² (a number of 24 digits) contains 22 as substring.

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

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, 1000096950 + ... + 1000097610.

Almost surely, 2^661064302080 is an apocalyptic number.

661064302080 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 661064302080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1486798213824).

661064302080 is an abundant number, since it is smaller than the sum of its proper divisors (2312532125568).

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

661064302080 is a wasteful number, since it uses less digits than its factorization.

661064302080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 744 counting only the distinct ones).

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

The spelling of 661064302080 in words is "six hundred sixty-one billion, sixty-four million, three hundred two thousand, eighty".