5451638656 has 16 divisors (see below), whose sum is σ = 10860686640. Its totient is φ = 2725819264.

The previous prime is 5451638651. The next prime is 5451638713. The reversal of 5451638656 is 6568361545.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5451638651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21295336 + ... + 21295591.

It is an arithmetic number, because the mean of its divisors is an integer number (678792915).

Almost surely, 2^5451638656 is an apocalyptic number.

It is an amenable number.

5451638656 is a deficient number, since it is larger than the sum of its proper divisors (5409047984).

5451638656 is an equidigital number, since it uses as much as digits as its factorization.

5451638656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42590941 (or 42590929 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 49.

The square root of 5451638656 is about 73835.2128459044. The cubic root of 5451638656 is about 1759.9852202616.

The spelling of 5451638656 in words is "five billion, four hundred fifty-one million, six hundred thirty-eight thousand, six hundred fifty-six".