155724772397 has 2 divisors, whose sum is σ = 155724772398. Its totient is φ = 155724772396.

The previous prime is 155724772297. The next prime is 155724772459. The reversal of 155724772397 is 793277427551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153240148681 + 2484623716 = 391459^2 + 49846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155724772397 is a prime.

It is a super-3 number, since 3×155724772397³ (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 (155724772297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77862386198 + 77862386199.

It is an arithmetic number, because the mean of its divisors is an integer number (77862386199).

Almost surely, 2^155724772397 is an apocalyptic number.

It is an amenable number.

155724772397 is a deficient number, since it is larger than the sum of its proper divisors (1).

155724772397 is an equidigital number, since it uses as much as digits as its factorization.

155724772397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25930800, while the sum is 59.

The spelling of 155724772397 in words is "one hundred fifty-five billion, seven hundred twenty-four million, seven hundred seventy-two thousand, three hundred ninety-seven".