1605913916261 has 8 divisors (see below), whose sum is σ = 1612658967744. Its totient is φ = 1599169538880.

The previous prime is 1605913916249. The next prime is 1605913916317. The reversal of 1605913916261 is 1626193195061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605913916261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605913916561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4928936 + ... + 5244638.

It is an arithmetic number, because the mean of its divisors is an integer number (201582370968).

Almost surely, 2^{1605913916261} is an apocalyptic number.

It is an amenable number.

1605913916261 is a deficient number, since it is larger than the sum of its proper divisors (6745051483).

1605913916261 is a wasteful number, since it uses less digits than its factorization.

1605913916261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337051.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 1605913916261 in words is "one trillion, six hundred five billion, nine hundred thirteen million, nine hundred sixteen thousand, two hundred sixty-one".