6666665231640 has 64 divisors (see below), whose sum is σ = 20338978694400. Its totient is φ = 1747645572992.

The previous prime is 6666665231599. The next prime is 6666665231651. The reversal of 6666665231640 is 461325666666.

It is a super-2 number, since 2×6666665231640² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470802612 + ... + 470816771.

It is an arithmetic number, because the mean of its divisors is an integer number (317796542100).

Almost surely, 2^{6666665231640} is an apocalyptic number.

6666665231640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6666665231640 is an abundant number, since it is smaller than the sum of its proper divisors (13672313462760).

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

6666665231640 is a wasteful number, since it uses less digits than its factorization.

6666665231640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941619456 (or 941619452 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 57.

The spelling of 6666665231640 in words is "six trillion, six hundred sixty-six billion, six hundred sixty-five million, two hundred thirty-one thousand, six hundred forty".