16161540077 has 2 divisors, whose sum is σ = 16161540078. Its totient is φ = 16161540076.

The previous prime is 16161540047. The next prime is 16161540121. The reversal of 16161540077 is 77004516161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15250768036 + 910772041 = 123494^2 + 30179^2 .

It is a cyclic number.

It is not a de Polignac number, because 16161540077 - 2²² = 16157345773 is a prime.

It is a super-2 number, since 2×16161540077² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16161540077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16161540047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8080770038 + 8080770039.

It is an arithmetic number, because the mean of its divisors is an integer number (8080770039).

Almost surely, 2^16161540077 is an apocalyptic number.

It is an amenable number.

16161540077 is a deficient number, since it is larger than the sum of its proper divisors (1).

16161540077 is an equidigital number, since it uses as much as digits as its factorization.

16161540077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 16161540077 in words is "sixteen billion, one hundred sixty-one million, five hundred forty thousand, seventy-seven".