161606051156551 has 2 divisors, whose sum is σ = 161606051156552. Its totient is φ = 161606051156550.

The previous prime is 161606051156519. The next prime is 161606051156587. The reversal of 161606051156551 is 155651150606161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161606051156551 - 2⁵ = 161606051156519 is a prime.

It is a super-2 number, since 2×161606051156551² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161606051156495 and 161606051156504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161606058156551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803025578275 + 80803025578276.

It is an arithmetic number, because the mean of its divisors is an integer number (80803025578276).

Almost surely, 2^{161606051156551} is an apocalyptic number.

161606051156551 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606051156551 is an equidigital number, since it uses as much as digits as its factorization.

161606051156551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810000, while the sum is 49.

The spelling of 161606051156551 in words is "one hundred sixty-one trillion, six hundred six billion, fifty-one million, one hundred fifty-six thousand, five hundred fifty-one".