61550550 has 96 divisors (see below), whose sum is σ = 171417600. Its totient is φ = 16238880.

The previous prime is 61550549. The next prime is 61550563. The reversal of 61550550 is 5505516.

61550550 is a `hidden beast` number, since 61 + 5 + 50 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 171271 + ... + 171629.

It is an arithmetic number, because the mean of its divisors is an integer number (1785600).

Almost surely, 2^61550550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61550550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85708800).

61550550 is an abundant number, since it is smaller than the sum of its proper divisors (109867050).

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

61550550 is a wasteful number, since it uses less digits than its factorization.

61550550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 61550550 is about 7845.4158589587. The cubic root of 61550550 is about 394.8304565338.

The spelling of 61550550 in words is "sixty-one million, five hundred fifty thousand, five hundred fifty".