161701631547 has 4 divisors (see below), whose sum is σ = 215602175400. Its totient is φ = 107801087696.

The previous prime is 161701631527. The next prime is 161701631573. The reversal of 161701631547 is 745136107161.

161701631547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745136107161 = 3 ⋅248378702387.

It is a cyclic number.

It is not a de Polignac number, because 161701631547 - 2⁷ = 161701631419 is a prime.

It is a super-2 number, since 2×161701631547² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161701631499 and 161701631508.

It is not an unprimeable number, because it can be changed into a prime (161701631527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26950271922 + ... + 26950271927.

It is an arithmetic number, because the mean of its divisors is an integer number (53900543850).

Almost surely, 2^161701631547 is an apocalyptic number.

161701631547 is a deficient number, since it is larger than the sum of its proper divisors (53900543853).

161701631547 is an equidigital number, since it uses as much as digits as its factorization.

161701631547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53900543852.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 161701631547 in words is "one hundred sixty-one billion, seven hundred one million, six hundred thirty-one thousand, five hundred forty-seven".