155616561655537 has 2 divisors, whose sum is σ = 155616561655538. Its totient is φ = 155616561655536.

The previous prime is 155616561655519. The next prime is 155616561655627. The reversal of 155616561655537 is 735556165616551.

155616561655537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78705836600161 + 76910725055376 = 8871631^2 + 8769876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155616561655537 is a prime.

It is a super-2 number, since 2×155616561655537² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155616561655507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77808280827768 + 77808280827769.

It is an arithmetic number, because the mean of its divisors is an integer number (77808280827769).

Almost surely, 2^{155616561655537} is an apocalyptic number.

It is an amenable number.

155616561655537 is a deficient number, since it is larger than the sum of its proper divisors (1).

155616561655537 is an equidigital number, since it uses as much as digits as its factorization.

155616561655537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 425250000, while the sum is 67.

The spelling of 155616561655537 in words is "one hundred fifty-five trillion, six hundred sixteen billion, five hundred sixty-one million, six hundred fifty-five thousand, five hundred thirty-seven".