16020791557 has 2 divisors, whose sum is σ = 16020791558. Its totient is φ = 16020791556.

The previous prime is 16020791539. The next prime is 16020791609. The reversal of 16020791557 is 75519702061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9102877281 + 6917914276 = 95409^2 + 83174^2 .

It is a cyclic number.

It is not a de Polignac number, because 16020791557 - 2⁷ = 16020791429 is a prime.

It is a super-2 number, since 2×16020791557² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16020794557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010395778 + 8010395779.

It is an arithmetic number, because the mean of its divisors is an integer number (8010395779).

Almost surely, 2^16020791557 is an apocalyptic number.

It is an amenable number.

16020791557 is a deficient number, since it is larger than the sum of its proper divisors (1).

16020791557 is an equidigital number, since it uses as much as digits as its factorization.

16020791557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 43.

The spelling of 16020791557 in words is "sixteen billion, twenty million, seven hundred ninety-one thousand, five hundred fifty-seven".