1666629140 has 24 divisors (see below), whose sum is σ = 3818096352. Its totient is φ = 606046880.

The previous prime is 1666629121. The next prime is 1666629193. The reversal of 1666629140 is 419266661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3787574 + ... + 3788013.

It is an arithmetic number, because the mean of its divisors is an integer number (159087348).

Almost surely, 2^1666629140 is an apocalyptic number.

1666629140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666629140 is an abundant number, since it is smaller than the sum of its proper divisors (2151467212).

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

1666629140 is a wasteful number, since it uses less digits than its factorization.

1666629140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7575607 (or 7575605 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 1666629140 is about 40824.3694378737. The cubic root of 1666629140 is about 1185.6222028733.

The spelling of 1666629140 in words is "one billion, six hundred sixty-six million, six hundred twenty-nine thousand, one hundred forty".