161899477629 has 16 divisors (see below), whose sum is σ = 225261153792. Its totient is φ = 103235797808.

The previous prime is 161899477601. The next prime is 161899477631. The reversal of 161899477629 is 926774998161.

It is a cyclic number.

It is not a de Polignac number, because 161899477629 - 2¹³ = 161899469437 is a prime.

It is a super-3 number, since 3×161899477629³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161899477669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2457214 + ... + 2522240.

It is an arithmetic number, because the mean of its divisors is an integer number (14078822112).

Almost surely, 2^161899477629 is an apocalyptic number.

It is an amenable number.

161899477629 is a deficient number, since it is larger than the sum of its proper divisors (63361676163).

161899477629 is a wasteful number, since it uses less digits than its factorization.

161899477629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101136.

The product of its digits is 82301184, while the sum is 69.

The spelling of 161899477629 in words is "one hundred sixty-one billion, eight hundred ninety-nine million, four hundred seventy-seven thousand, six hundred twenty-nine".