155683728677 has 2 divisors, whose sum is σ = 155683728678. Its totient is φ = 155683728676.

The previous prime is 155683728589. The next prime is 155683728709. The reversal of 155683728677 is 776827386551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108762103681 + 46921624996 = 329791^2 + 216614^2 .

It is an emirp because it is prime and its reverse (776827386551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155683728677 - 2¹⁶ = 155683663141 is a prime.

It is a super-3 number, since 3×155683728677³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155683718677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77841864338 + 77841864339.

It is an arithmetic number, because the mean of its divisors is an integer number (77841864339).

Almost surely, 2^155683728677 is an apocalyptic number.

It is an amenable number.

155683728677 is a deficient number, since it is larger than the sum of its proper divisors (1).

155683728677 is an equidigital number, since it uses as much as digits as its factorization.

155683728677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118540800, while the sum is 65.

The spelling of 155683728677 in words is "one hundred fifty-five billion, six hundred eighty-three million, seven hundred twenty-eight thousand, six hundred seventy-seven".