161166156556649 has 8 divisors (see below), whose sum is σ = 162003959457792. Its totient is φ = 160328381955840.

The previous prime is 161166156556591. The next prime is 161166156556661. The reversal of 161166156556649 is 946655651661161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161166156556649 is a prime.

It is a super-2 number, since 2×161166156556649² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161166156556549) 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, 4392404 + ... + 18483114.

It is an arithmetic number, because the mean of its divisors is an integer number (20250494932224).

Almost surely, 2^{161166156556649} is an apocalyptic number.

It is an amenable number.

161166156556649 is a deficient number, since it is larger than the sum of its proper divisors (837802901143).

161166156556649 is a wasteful number, since it uses less digits than its factorization.

161166156556649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14150167.

The product of its digits is 209952000, while the sum is 68.

The spelling of 161166156556649 in words is "one hundred sixty-one trillion, one hundred sixty-six billion, one hundred fifty-six million, five hundred fifty-six thousand, six hundred forty-nine".