1656555120 has 240 divisors, whose sum is σ = 6234145632. Its totient is φ = 390666240.

The previous prime is 1656555097. The next prime is 1656555133. The reversal of 1656555120 is 215556561.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 290214 + ... + 295866.

Almost surely, 2^1656555120 is an apocalyptic number.

1656555120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656555120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3117072816).

1656555120 is an abundant number, since it is smaller than the sum of its proper divisors (4577590512).

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

1656555120 is a wasteful number, since it uses less digits than its factorization.

1656555120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5720 (or 5711 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 1656555120 is about 40700.7999921377. The cubic root of 1656555120 is about 1183.2285233274.

The spelling of 1656555120 in words is "one billion, six hundred fifty-six million, five hundred fifty-five thousand, one hundred twenty".