2451621663 has 12 divisors (see below), whose sum is σ = 3749539248. Its totient is φ = 1538272320.

The previous prime is 2451621617. The next prime is 2451621677. The reversal of 2451621663 is 3661261542.

2451621663 is a `hidden beast` number, since 24 + 5 + 1 + 621 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 2451621663 - 2⁸ = 2451621407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2451621163) 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, 8011683 + ... + 8011988.

It is an arithmetic number, because the mean of its divisors is an integer number (312461604).

Almost surely, 2^2451621663 is an apocalyptic number.

2451621663 is a deficient number, since it is larger than the sum of its proper divisors (1297917585).

2451621663 is a wasteful number, since it uses less digits than its factorization.

2451621663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16023694 (or 16023691 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 2451621663 is about 49513.8532433096. The cubic root of 2451621663 is about 1348.3971214960.

The spelling of 2451621663 in words is "two billion, four hundred fifty-one million, six hundred twenty-one thousand, six hundred sixty-three".