61660512 has 72 divisors (see below), whose sum is σ = 176137416. Its totient is φ = 20461056.

The previous prime is 61660507. The next prime is 61660523. The reversal of 61660512 is 21506616.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99628 + ... + 100244.

It is an arithmetic number, because the mean of its divisors is an integer number (2446353).

Almost surely, 2^61660512 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 61660512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88068708).

61660512 is an abundant number, since it is smaller than the sum of its proper divisors (114476904).

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

61660512 is a wasteful number, since it uses less digits than its factorization.

61660512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61660512 is about 7852.4207732393. The cubic root of 61660512 is about 395.0654423430.

The spelling of 61660512 in words is "sixty-one million, six hundred sixty thousand, five hundred twelve".