2001656018 has 16 divisors (see below), whose sum is σ = 3027265920. Its totient is φ = 992596176.

The previous prime is 2001656003. The next prime is 2001656047. The reversal of 2001656018 is 8106561002.

It is a happy 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, 138071 + ... + 151877.

It is an arithmetic number, because the mean of its divisors is an integer number (189204120).

Almost surely, 2^2001656018 is an apocalyptic number.

2001656018 is a deficient number, since it is larger than the sum of its proper divisors (1025609902).

2001656018 is a wasteful number, since it uses less digits than its factorization.

2001656018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14401.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2001656018 is about 44739.8705630671. The cubic root of 2001656018 is about 1260.2686959507.

The spelling of 2001656018 in words is "two billion, one million, six hundred fifty-six thousand, eighteen".