155725780739 has 2 divisors, whose sum is σ = 155725780740. Its totient is φ = 155725780738.

The previous prime is 155725780709. The next prime is 155725780741. The reversal of 155725780739 is 937087527551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155725780739 - 2¹⁶ = 155725715203 is a prime.

It is a super-2 number, since 2×155725780739² (a number of 23 digits) contains 22 as substring.

Together with 155725780741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155725780709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77862890369 + 77862890370.

It is an arithmetic number, because the mean of its divisors is an integer number (77862890370).

Almost surely, 2^155725780739 is an apocalyptic number.

155725780739 is a deficient number, since it is larger than the sum of its proper divisors (1).

155725780739 is an equidigital number, since it uses as much as digits as its factorization.

155725780739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18522000, while the sum is 59.

The spelling of 155725780739 in words is "one hundred fifty-five billion, seven hundred twenty-five million, seven hundred eighty thousand, seven hundred thirty-nine".