613401660 has 120 divisors (see below), whose sum is σ = 1951731936. Its totient is φ = 161239680.

The previous prime is 613401647. The next prime is 613401661. The reversal of 613401660 is 66104316.

613401660 is a `hidden beast` number, since 613 + 40 + 1 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613401661) 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, 112354 + ... + 117686.

Almost surely, 2^613401660 is an apocalyptic number.

613401660 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 613401660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975865968).

613401660 is an abundant number, since it is smaller than the sum of its proper divisors (1338330276).

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

613401660 is a wasteful number, since it uses less digits than its factorization.

613401660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425 (or 5414 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 613401660 is about 24766.9469252873. The cubic root of 613401660 is about 849.6661480145. Note that the first 3 decimals are identical.

Adding to 613401660 its reverse (66104316), we get a palindrome (679505976).

The spelling of 613401660 in words is "six hundred thirteen million, four hundred one thousand, six hundred sixty".