661272192 has 96 divisors (see below), whose sum is σ = 2174746080. Its totient is φ = 188932608.

The previous prime is 661272169. The next prime is 661272193. The reversal of 661272192 is 291272166.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×661272192³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (661272193) 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 11 ways as a sum of consecutive naturals, for example, 32938 + ... + 49065.

It is an arithmetic number, because the mean of its divisors is an integer number (22653605).

Almost surely, 2^661272192 is an apocalyptic number.

It is an amenable number.

661272192 is an abundant number, since it is smaller than the sum of its proper divisors (1513473888).

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

661272192 is a wasteful number, since it uses less digits than its factorization.

661272192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82030 (or 82015 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 661272192 is about 25715.2132404147. The cubic root of 661272192 is about 871.2178267923.

The spelling of 661272192 in words is "six hundred sixty-one million, two hundred seventy-two thousand, one hundred ninety-two".