161966404582 has 32 divisors (see below), whose sum is σ = 249841013760. Its totient is φ = 78720216960.

The previous prime is 161966404573. The next prime is 161966404597. The reversal of 161966404582 is 285404669161.

It is a super-2 number, since 2×161966404582² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5732863 + ... + 5761045.

It is an arithmetic number, because the mean of its divisors is an integer number (7807531680).

Almost surely, 2^161966404582 is an apocalyptic number.

161966404582 is a deficient number, since it is larger than the sum of its proper divisors (87874609178).

161966404582 is a wasteful number, since it uses less digits than its factorization.

161966404582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28788.

The product of its (nonzero) digits is 2488320, while the sum is 52.

It can be divided in two parts, 1619 and 66404582, that added together give a square (66406201 = 8149²).

The spelling of 161966404582 in words is "one hundred sixty-one billion, nine hundred sixty-six million, four hundred four thousand, five hundred eighty-two".