129455697123 has 40 divisors (see below), whose sum is σ = 196742710736. Its totient is φ = 84807777600.

The previous prime is 129455697103. The next prime is 129455697131. The reversal of 129455697123 is 321796554921.

129455697123 is a `hidden beast` number, since 1 + 2 + 9 + 4 + 5 + 569 + 71 + 2 + 3 = 666.

It is not a de Polignac number, because 129455697123 - 2¹⁶ = 129455631587 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129455697123.

It is not an unprimeable number, because it can be changed into a prime (129455697103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5388528 + ... + 5412498.

Almost surely, 2^129455697123 is an apocalyptic number.

129455697123 is a deficient number, since it is larger than the sum of its proper divisors (67287013613).

129455697123 is a wasteful number, since it uses less digits than its factorization.

129455697123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25137 (or 25128 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The spelling of 129455697123 in words is "one hundred twenty-nine billion, four hundred fifty-five million, six hundred ninety-seven thousand, one hundred twenty-three".