61116510 has 128 divisors (see below), whose sum is σ = 183988224. Its totient is φ = 12648960.

The previous prime is 61116491. The next prime is 61116511. The reversal of 61116510 is 1561116.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61116511) 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, 166347 + ... + 166713.

It is an arithmetic number, because the mean of its divisors is an integer number (1437408).

Almost surely, 2^61116510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61116510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91994112).

61116510 is an abundant number, since it is smaller than the sum of its proper divisors (122871714).

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

61116510 is a wasteful number, since it uses less digits than its factorization.

61116510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 61116510 is about 7817.7049061729. The cubic root of 61116510 is about 393.9001825696.

Adding to 61116510 its reverse (1561116), we get a palindrome (62677626).

It can be divided in two parts, 6111 and 6510, that added together give a palindrome (12621).

The spelling of 61116510 in words is "sixty-one million, one hundred sixteen thousand, five hundred ten".