2505747621 has 24 divisors (see below), whose sum is σ = 3686065056. Its totient is φ = 1512888000.

The previous prime is 2505747617. The next prime is 2505747637. The reversal of 2505747621 is 1267475052.

2505747621 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 2505747621 - 2² = 2505747617 is a prime.

It is a super-2 number, since 2×2505747621² = 12557542280294319282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 2505747621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505747611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19755 + ... + 73496.

It is an arithmetic number, because the mean of its divisors is an integer number (153586044).

Almost surely, 2^2505747621 is an apocalyptic number.

It is an amenable number.

2505747621 is a deficient number, since it is larger than the sum of its proper divisors (1180317435).

2505747621 is a wasteful number, since it uses less digits than its factorization.

2505747621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93333 (or 93320 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 2505747621 is about 50057.4432127731. The cubic root of 2505747621 is about 1358.2481084832.

The spelling of 2505747621 in words is "two billion, five hundred five million, seven hundred forty-seven thousand, six hundred twenty-one".