1656154890 has 128 divisors (see below), whose sum is σ = 4867188480. Its totient is φ = 398151936.

The previous prime is 1656154889. The next prime is 1656154901. The reversal of 1656154890 is 984516561.

1656154890 is a `hidden beast` number, since 1 + 6 + 561 + 5 + 4 + 89 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 145444 + ... + 156416.

It is an arithmetic number, because the mean of its divisors is an integer number (38024910).

Almost surely, 2^1656154890 is an apocalyptic number.

1656154890 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 1656154890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2433594240).

1656154890 is an abundant number, since it is smaller than the sum of its proper divisors (3211033590).

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

1656154890 is a wasteful number, since it uses less digits than its factorization.

1656154890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11045 (or 11039 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 1656154890 is about 40695.8829613021. The cubic root of 1656154890 is about 1183.1332248192.

The spelling of 1656154890 in words is "one billion, six hundred fifty-six million, one hundred fifty-four thousand, eight hundred ninety".