1640016623 has 12 divisors (see below), whose sum is σ = 1913557032. Its totient is φ = 1401467760.

The previous prime is 1640016619. The next prime is 1640016629. The reversal of 1640016623 is 3266100461.

It is a happy number.

It is not a de Polignac number, because 1640016623 - 2² = 1640016619 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 (1640016629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34340 + ... + 66777.

It is an arithmetic number, because the mean of its divisors is an integer number (159463086).

Almost surely, 2^1640016623 is an apocalyptic number.

1640016623 is a deficient number, since it is larger than the sum of its proper divisors (273540409).

1640016623 is a wasteful number, since it uses less digits than its factorization.

1640016623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101462 (or 101455 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1640016623 is about 40497.1186999767. The cubic root of 1640016623 is about 1179.2776923438.

The spelling of 1640016623 in words is "one billion, six hundred forty million, sixteen thousand, six hundred twenty-three".