1655513550 has 216 divisors, whose sum is σ = 4965392016. Its totient is φ = 393338880.

The previous prime is 1655513537. The next prime is 1655513557. The reversal of 1655513550 is 553155561.

1655513550 is a `hidden beast` number, since 1 + 6 + 55 + 51 + 3 + 550 = 666.

It is a super-2 number, since 2×1655513550² = 5481450228467205000, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655513557) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 17067102 + ... + 17067198.

It is an arithmetic number, because the mean of its divisors is an integer number (22987926).

Almost surely, 2^1655513550 is an apocalyptic number.

1655513550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1655513550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2482696008).

1655513550 is an abundant number, since it is smaller than the sum of its proper divisors (3309878466).

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

1655513550 is a wasteful number, since it uses less digits than its factorization.

1655513550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 56250, while the sum is 36.

The square root of 1655513550 is about 40688.0025314588. The cubic root of 1655513550 is about 1182.9804837452.

The spelling of 1655513550 in words is "one billion, six hundred fifty-five million, five hundred thirteen thousand, five hundred fifty".