660155943 has 16 divisors (see below), whose sum is σ = 917436416. Its totient is φ = 421765920.

The previous prime is 660155939. The next prime is 660155957. The reversal of 660155943 is 349551066.

It is not a de Polignac number, because 660155943 - 2² = 660155939 is a prime.

It is the 25694-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660155963) by changing a digit.

It is a nontrivial repunit in base 25693.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24880 + ... + 44037.

It is an arithmetic number, because the mean of its divisors is an integer number (57339776).

Almost surely, 2^660155943 is an apocalyptic number.

660155943 is a deficient number, since it is larger than the sum of its proper divisors (257280473).

660155943 is a wasteful number, since it uses less digits than its factorization.

660155943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69054.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 660155943 is about 25693.5000145951. The cubic root of 660155943 is about 870.7273360105.

The spelling of 660155943 in words is "six hundred sixty million, one hundred fifty-five thousand, nine hundred forty-three".