1655616039989 has 2 divisors, whose sum is σ = 1655616039990. Its totient is φ = 1655616039988.

The previous prime is 1655616039887. The next prime is 1655616040079. The reversal of 1655616039989 is 9899306165561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1454575899364 + 201040140625 = 1206058^2 + 448375^2 .

It is an emirp because it is prime and its reverse (9899306165561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655616039989 - 2¹² = 1655616035893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655616099989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827808019994 + 827808019995.

It is an arithmetic number, because the mean of its divisors is an integer number (827808019995).

Almost surely, 2^{1655616039989} is an apocalyptic number.

It is an amenable number.

1655616039989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655616039989 is an equidigital number, since it uses as much as digits as its factorization.

1655616039989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94478400, while the sum is 68.

The spelling of 1655616039989 in words is "one trillion, six hundred fifty-five billion, six hundred sixteen million, thirty-nine thousand, nine hundred eighty-nine".