2051004557644 has 48 divisors (see below), whose sum is σ = 4230955729728. Its totient is φ = 851574463488.

The previous prime is 2051004557611. The next prime is 2051004557647. The reversal of 2051004557644 is 4467554001502.

It is a self number, because there is not a number n which added to its sum of digits gives 2051004557644.

It is not an unprimeable number, because it can be changed into a prime (2051004557647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4006969 + ... + 4489744.

It is an arithmetic number, because the mean of its divisors is an integer number (88144911036).

Almost surely, 2^{2051004557644} is an apocalyptic number.

It is an amenable number.

2051004557644 is an abundant number, since it is smaller than the sum of its proper divisors (2179951172084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2051004557644 is a wasteful number, since it uses less digits than its factorization.

2051004557644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496994 (or 8496992 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 43.

The spelling of 2051004557644 in words is "two trillion, fifty-one billion, four million, five hundred fifty-seven thousand, six hundred forty-four".