2001012616 has 8 divisors (see below), whose sum is σ = 3751898670. Its totient is φ = 1000506304.

The previous prime is 2001012529. The next prime is 2001012641. The reversal of 2001012616 is 6162101002.

It can be written as a sum of positive squares in only one way, i.e., 1587703716 + 413308900 = 39846^2 + 20330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2001012593 and 2001012602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125063281 + ... + 125063296.

Almost surely, 2^2001012616 is an apocalyptic number.

It is an amenable number.

2001012616 is a deficient number, since it is larger than the sum of its proper divisors (1750886054).

2001012616 is a wasteful number, since it uses less digits than its factorization.

2001012616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250126583 (or 250126579 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2001012616 is about 44732.6795083863. The cubic root of 2001012616 is about 1260.1336500542.

Adding to 2001012616 its reverse (6162101002), we get a palindrome (8163113618).

The spelling of 2001012616 in words is "two billion, one million, twelve thousand, six hundred sixteen".