1656161520 has 160 divisors (see below), whose sum is σ = 5544770112. Its totient is φ = 406511616.

The previous prime is 1656161497. The next prime is 1656161527. The reversal of 1656161520 is 251616561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656161527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1737364 + ... + 1738316.

Almost surely, 2^1656161520 is an apocalyptic number.

1656161520 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 1656161520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772385056).

1656161520 is an abundant number, since it is smaller than the sum of its proper divisors (3888608592).

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

1656161520 is a wasteful number, since it uses less digits than its factorization.

1656161520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1533 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1656161520 is about 40695.9644190920. The cubic root of 1656161520 is about 1183.1348036093.

The spelling of 1656161520 in words is "one billion, six hundred fifty-six million, one hundred sixty-one thousand, five hundred twenty".