161996849620 has 48 divisors (see below), whose sum is σ = 358334706240. Its totient is φ = 61347753216.

The previous prime is 161996849611. The next prime is 161996849657. The reversal of 161996849620 is 26948699161.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438784 + ... + 718696.

It is an arithmetic number, because the mean of its divisors is an integer number (7465306380).

Almost surely, 2^161996849620 is an apocalyptic number.

161996849620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161996849620 is an abundant number, since it is smaller than the sum of its proper divisors (196337856620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161996849620 is a wasteful number, since it uses less digits than its factorization.

161996849620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281464 (or 281462 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 161996849620 in words is "one hundred sixty-one billion, nine hundred ninety-six million, eight hundred forty-nine thousand, six hundred twenty".