1601495521920 has 1536 divisors, whose sum is σ = 6799533465600. Its totient is φ = 355053404160.

The previous prime is 1601495521883. The next prime is 1601495521979. The reversal of 1601495521920 is 291255941061.

1601495521920 is a `hidden beast` number, since 1 + 6 + 0 + 1 + 4 + 9 + 552 + 1 + 92 + 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 191 ways as a sum of consecutive naturals, for example, 5699272180 + ... + 5699272460.

It is an arithmetic number, because the mean of its divisors is an integer number (4426779600).

Almost surely, 2^{1601495521920} is an apocalyptic number.

1601495521920 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 1601495521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3399766732800).

1601495521920 is an abundant number, since it is smaller than the sum of its proper divisors (5198037943680).

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

1601495521920 is a wasteful number, since it uses less digits than its factorization.

1601495521920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 1601495521920 in words is "one trillion, six hundred one billion, four hundred ninety-five million, five hundred twenty-one thousand, nine hundred twenty".