1616591663077 has 2 divisors, whose sum is σ = 1616591663078. Its totient is φ = 1616591663076.

The previous prime is 1616591663009. The next prime is 1616591663083. The reversal of 1616591663077 is 7703661956161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153145231716 + 463446431361 = 1073846^2 + 680769^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616591663077 - 2¹⁵ = 1616591630309 is a prime.

It is a super-2 number, since 2×1616591663077² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616591663377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808295831538 + 808295831539.

It is an arithmetic number, because the mean of its divisors is an integer number (808295831539).

Almost surely, 2^{1616591663077} is an apocalyptic number.

It is an amenable number.

1616591663077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616591663077 is an equidigital number, since it uses as much as digits as its factorization.

1616591663077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8573040, while the sum is 58.

The spelling of 1616591663077 in words is "one trillion, six hundred sixteen billion, five hundred ninety-one million, six hundred sixty-three thousand, seventy-seven".