161356222525402 has 16 divisors (see below), whose sum is σ = 242386292425032. Its totient is φ = 80560832050240.

The previous prime is 161356222525397. The next prime is 161356222525409. The reversal of 161356222525402 is 204525222653161.

161356222525402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 161026988708881 + 329233816521 = 12689641^2 + 573789^2 .

It is not an unprimeable number, because it can be changed into a prime (161356222525409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2076913 + ... + 18083860.

Almost surely, 2^{161356222525402} is an apocalyptic number.

161356222525402 is a deficient number, since it is larger than the sum of its proper divisors (81030069899630).

161356222525402 is a wasteful number, since it uses less digits than its factorization.

161356222525402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20166593.

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 161356222525402 in words is "one hundred sixty-one trillion, three hundred fifty-six billion, two hundred twenty-two million, five hundred twenty-five thousand, four hundred two".