1601602646661 has 60 divisors (see below), whose sum is σ = 2425156419840. Its totient is φ = 1053281627280.

The previous prime is 1601602646653. The next prime is 1601602646671. The reversal of 1601602646661 is 1666462061061.

It is a happy number.

It is not a de Polignac number, because 1601602646661 - 2³ = 1601602646653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601602646671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1855854316 + ... + 1855855178.

It is an arithmetic number, because the mean of its divisors is an integer number (40419273664).

Almost surely, 2^{1601602646661} is an apocalyptic number.

It is an amenable number.

1601602646661 is a deficient number, since it is larger than the sum of its proper divisors (823553773179).

1601602646661 is an frugal number, since it uses more digits than its factorization.

1601602646661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 1601602646661 in words is "one trillion, six hundred one billion, six hundred two million, six hundred forty-six thousand, six hundred sixty-one".