55516660 has 48 divisors (see below), whose sum is σ = 121347072. Its totient is φ = 21312000.

The previous prime is 55516639. The next prime is 55516661. The reversal of 55516660 is 6661555.

55516660 = T₂₅₁ + T₂₅₂ + ... + T₇₀₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55516661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93324 + ... + 93916.

It is an arithmetic number, because the mean of its divisors is an integer number (2528064).

Almost surely, 2^55516660 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 55516660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60673536).

55516660 is an abundant number, since it is smaller than the sum of its proper divisors (65830412).

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

55516660 is a wasteful number, since it uses less digits than its factorization.

55516660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 55516660 is about 7450.9502749649. The cubic root of 55516660 is about 381.4823448020.

The spelling of 55516660 in words is "fifty-five million, five hundred sixteen thousand, six hundred sixty".