1551637648 has 20 divisors (see below), whose sum is σ = 3279598128. Its totient is φ = 705289760.

The previous prime is 1551637627. The next prime is 1551637667. The reversal of 1551637648 is 8467361551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1551637598 and 1551637607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4407886 + ... + 4408237.

Almost surely, 2^1551637648 is an apocalyptic number.

It is an amenable number.

1551637648 is an abundant number, since it is smaller than the sum of its proper divisors (1727960480).

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

1551637648 is a wasteful number, since it uses less digits than its factorization.

1551637648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8816142 (or 8816136 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The square root of 1551637648 is about 39390.8320298010. The cubic root of 1551637648 is about 1157.7019625294.

The spelling of 1551637648 in words is "one billion, five hundred fifty-one million, six hundred thirty-seven thousand, six hundred forty-eight".