1641001640 has 32 divisors (see below), whose sum is σ = 3700270080. Its totient is φ = 654975552.

The previous prime is 1641001591. The next prime is 1641001643. The reversal of 1641001640 is 461001461.

It is not an unprimeable number, because it can be changed into a prime (1641001643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25784 + ... + 62823.

It is an arithmetic number, because the mean of its divisors is an integer number (115633440).

Almost surely, 2^1641001640 is an apocalyptic number.

1641001640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641001640 is an abundant number, since it is smaller than the sum of its proper divisors (2059268440).

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

1641001640 is a wasteful number, since it uses less digits than its factorization.

1641001640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89081 (or 89077 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1641001640 is about 40509.2784433394. The cubic root of 1641001640 is about 1179.5137420026.

The spelling of 1641001640 in words is "one billion, six hundred forty-one million, one thousand, six hundred forty".