161640163152406 has 256 divisors, whose sum is σ = 273367581696000. Its totient is φ = 71363761717248.

The previous prime is 161640163152341. The next prime is 161640163152431. The reversal of 161640163152406 is 604251361046161.

161640163152406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161640163152406² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 295503040225 + ... + 295503040771.

It is an arithmetic number, because the mean of its divisors is an integer number (1067842116000).

Almost surely, 2^{161640163152406} is an apocalyptic number.

161640163152406 is a deficient number, since it is larger than the sum of its proper divisors (111727418543594).

161640163152406 is a wasteful number, since it uses less digits than its factorization.

161640163152406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 161640163152406 in words is "one hundred sixty-one trillion, six hundred forty billion, one hundred sixty-three million, one hundred fifty-two thousand, four hundred six".