2001440497957 has 4 divisors (see below), whose sum is σ = 2001452023116. Its totient is φ = 2001428972800.

The previous prime is 2001440497951. The next prime is 2001440497967. The reversal of 2001440497957 is 7597940441002.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1337200827876 + 664239670081 = 1156374^2 + 815009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001440497957 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 (2001440497951) 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, 5498044 + ... + 5850757.

It is an arithmetic number, because the mean of its divisors is an integer number (500363005779).

Almost surely, 2^{2001440497957} is an apocalyptic number.

It is an amenable number.

2001440497957 is a deficient number, since it is larger than the sum of its proper divisors (11525159).

2001440497957 is a wasteful number, since it uses less digits than its factorization.

2001440497957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11525158.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 2001440497957 in words is "two trillion, one billion, four hundred forty million, four hundred ninety-seven thousand, nine hundred fifty-seven".