155954174681 has 2 divisors, whose sum is σ = 155954174682. Its totient is φ = 155954174680.

The previous prime is 155954174591. The next prime is 155954174731. The reversal of 155954174681 is 186471459551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116223719056 + 39730455625 = 340916^2 + 199325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155954174681 is a prime.

It is a super-2 number, since 2×155954174681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155954170681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77977087340 + 77977087341.

It is an arithmetic number, because the mean of its divisors is an integer number (77977087341).

Almost surely, 2^155954174681 is an apocalyptic number.

It is an amenable number.

155954174681 is a deficient number, since it is larger than the sum of its proper divisors (1).

155954174681 is an equidigital number, since it uses as much as digits as its factorization.

155954174681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048000, while the sum is 56.

The spelling of 155954174681 in words is "one hundred fifty-five billion, nine hundred fifty-four million, one hundred seventy-four thousand, six hundred eighty-one".