1601891515620 has 72 divisors (see below), whose sum is σ = 5300804658240. Its totient is φ = 388337336640.

The previous prime is 1601891515591. The next prime is 1601891515621. The reversal of 1601891515620 is 265151981061.

1601891515620 is a `hidden beast` number, since 1 + 6 + 0 + 1 + 8 + 9 + 1 + 5 + 15 + 620 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1601891515621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 404516080 + ... + 404520039.

It is an arithmetic number, because the mean of its divisors is an integer number (73622286920).

Almost surely, 2^{1601891515620} is an apocalyptic number.

1601891515620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601891515620 is an abundant number, since it is smaller than the sum of its proper divisors (3698913142620).

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

1601891515620 is a wasteful number, since it uses less digits than its factorization.

1601891515620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809036145 (or 809036140 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The spelling of 1601891515620 in words is "one trillion, six hundred one billion, eight hundred ninety-one million, five hundred fifteen thousand, six hundred twenty".