61660500 has 192 divisors, whose sum is σ = 203164416. Its totient is φ = 14400000.

The previous prime is 61660481. The next prime is 61660507. The reversal of 61660500 is 506616.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 610450 + ... + 610550.

It is an arithmetic number, because the mean of its divisors is an integer number (1058148).

Almost surely, 2^61660500 is an apocalyptic number.

61660500 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 61660500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101582208).

61660500 is an abundant number, since it is smaller than the sum of its proper divisors (141503916).

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

61660500 is a wasteful number, since it uses less digits than its factorization.

61660500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61660500 is about 7852.4200091437. The cubic root of 61660500 is about 395.0654167146.

It can be divided in two parts, 616 and 60500, that added together give a palindrome (61116).

The spelling of 61660500 in words is "sixty-one million, six hundred sixty thousand, five hundred".