61660000 has 60 divisors (see below), whose sum is σ = 151742052. Its totient is φ = 24656000.

The previous prime is 61659989. The next prime is 61660007. The reversal of 61660000 is 6616.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61660000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18459 + ... + 21541.

Almost surely, 2^61660000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75871026).

61660000 is an abundant number, since it is smaller than the sum of its proper divisors (90082052).

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

61660000 is an equidigital number, since it uses as much as digits as its factorization.

61660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113 (or 3090 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 61660000 is about 7852.3881717602. The cubic root of 61660000 is about 395.0643488606.

Adding to 61660000 its reverse (6616), we get a palindrome (61666616).

The spelling of 61660000 in words is "sixty-one million, six hundred sixty thousand".