161662321563 has 8 divisors (see below), whose sum is σ = 216137092608. Its totient is φ = 107481215784.

The previous prime is 161662321553. The next prime is 161662321567. The reversal of 161662321563 is 365123266161.

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

It is not a de Polignac number, because 161662321563 - 2⁸ = 161662321307 is a prime.

It is a super-2 number, since 2×161662321563² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161662321567) 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, 73415031 + ... + 73417232.

It is an arithmetic number, because the mean of its divisors is an integer number (27017136576).

Almost surely, 2^161662321563 is an apocalyptic number.

161662321563 is a deficient number, since it is larger than the sum of its proper divisors (54474771045).

161662321563 is a wasteful number, since it uses less digits than its factorization.

161662321563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146832633.

The product of its digits is 233280, while the sum is 42.

The spelling of 161662321563 in words is "one hundred sixty-one billion, six hundred sixty-two million, three hundred twenty-one thousand, five hundred sixty-three".