161070643 has 4 divisors (see below), whose sum is σ = 162137488. Its totient is φ = 160003800.

The previous prime is 161070617. The next prime is 161070653. The reversal of 161070643 is 346070161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346070161 = 19 ⋅18214219.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161070643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161070653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533196 + ... + 533497.

It is an arithmetic number, because the mean of its divisors is an integer number (40534372).

Almost surely, 2^161070643 is an apocalyptic number.

161070643 is a deficient number, since it is larger than the sum of its proper divisors (1066845).

161070643 is a wasteful number, since it uses less digits than its factorization.

161070643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066844.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 161070643 is about 12691.3609593298. The cubic root of 161070643 is about 544.0917374756.

The spelling of 161070643 in words is "one hundred sixty-one million, seventy thousand, six hundred forty-three".