156656193781 has 2 divisors, whose sum is σ = 156656193782. Its totient is φ = 156656193780.

The previous prime is 156656193691. The next prime is 156656193839. The reversal of 156656193781 is 187391656651.

It is an a-pointer prime, because the next prime (156656193839) can be obtained adding 156656193781 to its sum of digits (58).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155275402500 + 1380791281 = 394050^2 + 37159^2 .

It is a cyclic number.

It is not a de Polignac number, because 156656193781 - 2⁷ = 156656193653 is a prime.

It is a super-2 number, since 2×156656193781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156656191781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78328096890 + 78328096891.

It is an arithmetic number, because the mean of its divisors is an integer number (78328096891).

Almost surely, 2^156656193781 is an apocalyptic number.

It is an amenable number.

156656193781 is a deficient number, since it is larger than the sum of its proper divisors (1).

156656193781 is an equidigital number, since it uses as much as digits as its factorization.

156656193781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 58.

The spelling of 156656193781 in words is "one hundred fifty-six billion, six hundred fifty-six million, one hundred ninety-three thousand, seven hundred eighty-one".