161210644 has 12 divisors (see below), whose sum is σ = 322421344. Its totient is φ = 69090264.

The previous prime is 161210641. The next prime is 161210653. The reversal of 161210644 is 446012161.

161210644 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161210641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2878734 + ... + 2878789.

Almost surely, 2^161210644 is an apocalyptic number.

161210644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161210644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161210644 is a wasteful number, since it uses less digits than its factorization.

161210644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5757534 (or 5757532 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 161210644 is about 12696.8753636475. The cubic root of 161210644 is about 544.2493315325.

The spelling of 161210644 in words is "one hundred sixty-one million, two hundred ten thousand, six hundred forty-four".