661348181160 has 160 divisors (see below), whose sum is σ = 2247841708200. Its totient is φ = 174377871360.

The previous prime is 661348181119. The next prime is 661348181167. The reversal of 661348181160 is 61181843166.

661348181160 is a `hidden beast` number, since 6 + 6 + 1 + 3 + 481 + 8 + 1 + 160 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 473462343396 + 187885837764 = 688086^2 + 433458^2 .

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

It is not an unprimeable number, because it can be changed into a prime (661348181167) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 858381 + ... + 1435100.

Almost surely, 2^661348181160 is an apocalyptic number.

661348181160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661348181160 is an abundant number, since it is smaller than the sum of its proper divisors (1586493527040).

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

661348181160 is a wasteful number, since it uses less digits than its factorization.

661348181160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293593 (or 2293580 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 661348181160 in words is "six hundred sixty-one billion, three hundred forty-eight million, one hundred eighty-one thousand, one hundred sixty".