645545546403 has 16 divisors (see below), whose sum is σ = 865085570976. Its totient is φ = 428190094080.

The previous prime is 645545546383. The next prime is 645545546413. The reversal of 645545546403 is 304645545546.

It is not a de Polignac number, because 645545546403 - 2¹⁷ = 645545415331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645545546413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214050 + ... + 1156247.

It is an arithmetic number, because the mean of its divisors is an integer number (54067848186).

Almost surely, 2^645545546403 is an apocalyptic number.

645545546403 is a deficient number, since it is larger than the sum of its proper divisors (219540024573).

645545546403 is a wasteful number, since it uses less digits than its factorization.

645545546403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371094.

The product of its (nonzero) digits is 17280000, while the sum is 51.

The spelling of 645545546403 in words is "six hundred forty-five billion, five hundred forty-five million, five hundred forty-six thousand, four hundred three".