2503661621 has 12 divisors (see below), whose sum is σ = 2661881568. Its totient is φ = 2354365632.

The previous prime is 2503661599. The next prime is 2503661681. The reversal of 2503661621 is 1261663052.

2503661621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2503661621 - 2¹⁴ = 2503645237 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 (2503661681) 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, 415190 + ... + 421176.

It is an arithmetic number, because the mean of its divisors is an integer number (221823464).

Almost surely, 2^2503661621 is an apocalyptic number.

It is an amenable number.

2503661621 is a deficient number, since it is larger than the sum of its proper divisors (158219947).

2503661621 is a wasteful number, since it uses less digits than its factorization.

2503661621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468 (or 7451 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2503661621 is about 50036.6028123413. The cubic root of 2503661621 is about 1357.8710962994.

The spelling of 2503661621 in words is "two billion, five hundred three million, six hundred sixty-one thousand, six hundred twenty-one".