1661602896 has 240 divisors, whose sum is σ = 5156336640. Its totient is φ = 516481920.

The previous prime is 1661602889. The next prime is 1661602927. The reversal of 1661602896 is 6982061661.

1661602896 is a `hidden beast` number, since 1 + 6 + 616 + 0 + 28 + 9 + 6 = 666.

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, 6131241 + ... + 6131511.

It is an arithmetic number, because the mean of its divisors is an integer number (21484736).

Almost surely, 2^1661602896 is an apocalyptic number.

1661602896 is a gapful number since it is divisible by the number (16) 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 1661602896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2578168320).

1661602896 is an abundant number, since it is smaller than the sum of its proper divisors (3494733744).

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

1661602896 is a wasteful number, since it uses less digits than its factorization.

1661602896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1661602896 is about 40762.7635962038. The cubic root of 1661602896 is about 1184.4291305739.

The spelling of 1661602896 in words is "one billion, six hundred sixty-one million, six hundred two thousand, eight hundred ninety-six".