1606020720557 has 12 divisors (see below), whose sum is σ = 1765330173600. Its totient is φ = 1459990161960.

The previous prime is 1606020720541. The next prime is 1606020720659. The reversal of 1606020720557 is 7550270206061.

It is not a de Polignac number, because 1606020720557 - 2⁴ = 1606020720541 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 (1606020120557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8299694 + ... + 8490992.

It is an arithmetic number, because the mean of its divisors is an integer number (147110847800).

Almost surely, 2^{1606020720557} is an apocalyptic number.

It is an amenable number.

1606020720557 is a deficient number, since it is larger than the sum of its proper divisors (159309453043).

1606020720557 is a wasteful number, since it uses less digits than its factorization.

1606020720557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260704 (or 260693 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 1606020720557 in words is "one trillion, six hundred six billion, twenty million, seven hundred twenty thousand, five hundred fifty-seven".