1640150671 has 4 divisors (see below), whose sum is σ = 1640315152. Its totient is φ = 1639986192.

The previous prime is 1640150663. The next prime is 1640150693. The reversal of 1640150671 is 1760510461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1640150671 - 2³ = 1640150663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640150621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66246 + ... + 87571.

It is an arithmetic number, because the mean of its divisors is an integer number (410078788).

Almost surely, 2^1640150671 is an apocalyptic number.

1640150671 is a deficient number, since it is larger than the sum of its proper divisors (164481).

1640150671 is a wasteful number, since it uses less digits than its factorization.

1640150671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164480.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1640150671 is about 40498.7736974837. The cubic root of 1640150671 is about 1179.3098211867.

The spelling of 1640150671 in words is "one billion, six hundred forty million, one hundred fifty thousand, six hundred seventy-one".