155704062781 has 4 divisors (see below), whose sum is σ = 159912280732. Its totient is φ = 151495844832.

The previous prime is 155704062779. The next prime is 155704062859. The reversal of 155704062781 is 187260407551.

155704062781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120311165881 + 35392896900 = 346859^2 + 188130^2 .

It is a cyclic number.

It is not a de Polignac number, because 155704062781 - 2¹ = 155704062779 is a prime.

It is a super-2 number, since 2×155704062781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155704062181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104108920 + ... + 2104108993.

It is an arithmetic number, because the mean of its divisors is an integer number (39978070183).

Almost surely, 2^155704062781 is an apocalyptic number.

It is an amenable number.

155704062781 is a deficient number, since it is larger than the sum of its proper divisors (4208217951).

155704062781 is an equidigital number, since it uses as much as digits as its factorization.

155704062781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208217950.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 155704062781 in words is "one hundred fifty-five billion, seven hundred four million, sixty-two thousand, seven hundred eighty-one".