1641755640 has 128 divisors (see below), whose sum is σ = 5873679360. Its totient is φ = 358938624.

The previous prime is 1641755639. The next prime is 1641755657. The reversal of 1641755640 is 465571461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23169 + ... + 61808.

It is an arithmetic number, because the mean of its divisors is an integer number (45888120).

Almost surely, 2^1641755640 is an apocalyptic number.

1641755640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641755640 is an abundant number, since it is smaller than the sum of its proper divisors (4231923720).

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

1641755640 is a wasteful number, since it uses less digits than its factorization.

1641755640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85021 (or 85017 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 1641755640 is about 40518.5838844351. The cubic root of 1641755640 is about 1179.6943668849.

The spelling of 1641755640 in words is "one billion, six hundred forty-one million, seven hundred fifty-five thousand, six hundred forty".