155072056781 has 16 divisors (see below), whose sum is σ = 172938427200. Its totient is φ = 138186425088.

The previous prime is 155072056771. The next prime is 155072056793. The reversal of 155072056781 is 187650270551.

It is a cyclic number.

It is not a de Polignac number, because 155072056781 - 2⁶ = 155072056717 is a prime.

It is a super-2 number, since 2×155072056781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155072056721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405050 + ... + 688628.

It is an arithmetic number, because the mean of its divisors is an integer number (10808651700).

Almost surely, 2^155072056781 is an apocalyptic number.

It is an amenable number.

155072056781 is a deficient number, since it is larger than the sum of its proper divisors (17866370419).

155072056781 is a wasteful number, since it uses less digits than its factorization.

155072056781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285308.

The product of its (nonzero) digits is 588000, while the sum is 47.

The spelling of 155072056781 in words is "one hundred fifty-five billion, seventy-two million, fifty-six thousand, seven hundred eighty-one".