655401461220 has 144 divisors (see below), whose sum is σ = 2238743969280. Its totient is φ = 153759859200.

The previous prime is 655401461219. The next prime is 655401461243. The reversal of 655401461220 is 22164104556.

655401461220 is a `hidden beast` number, since 6 + 5 + 5 + 4 + 0 + 14 + 612 + 20 = 666.

It is a super-2 number, since 2×655401461220² (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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5277505 + ... + 5400264.

It is an arithmetic number, because the mean of its divisors is an integer number (15546833120).

Almost surely, 2^655401461220 is an apocalyptic number.

655401461220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655401461220 is an abundant number, since it is smaller than the sum of its proper divisors (1583342508060).

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

655401461220 is a wasteful number, since it uses less digits than its factorization.

655401461220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677826 (or 10677821 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 655401461220 its reverse (22164104556), we get a palindrome (677565565776).

The spelling of 655401461220 in words is "six hundred fifty-five billion, four hundred one million, four hundred sixty-one thousand, two hundred twenty".