161421101652 has 48 divisors (see below), whose sum is σ = 377442882432. Its totient is φ = 53693736960.

The previous prime is 161421101651. The next prime is 161421101707. The reversal of 161421101652 is 256101124161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161421101651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33136777 + ... + 33141647.

It is an arithmetic number, because the mean of its divisors is an integer number (7863393384).

Almost surely, 2^161421101652 is an apocalyptic number.

161421101652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161421101652 is an abundant number, since it is smaller than the sum of its proper divisors (216021780780).

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

161421101652 is a wasteful number, since it uses less digits than its factorization.

161421101652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10128 (or 10126 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The spelling of 161421101652 in words is "one hundred sixty-one billion, four hundred twenty-one million, one hundred one thousand, six hundred fifty-two".