645260643545 has 16 divisors (see below), whose sum is σ = 890789346048. Its totient is φ = 439534209600.

The previous prime is 645260643509. The next prime is 645260643569. The reversal of 645260643545 is 545346062546.

It is not a de Polignac number, because 645260643545 - 2¹² = 645260639449 is a prime.

It is a super-2 number, since 2×645260643545² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645260643493 and 645260643502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61041134 + ... + 61051703.

It is an arithmetic number, because the mean of its divisors is an integer number (55674334128).

Almost surely, 2^645260643545 is an apocalyptic number.

It is an amenable number.

645260643545 is a deficient number, since it is larger than the sum of its proper divisors (245528702503).

645260643545 is a wasteful number, since it uses less digits than its factorization.

645260643545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122093000.

The product of its (nonzero) digits is 10368000, while the sum is 50.

The spelling of 645260643545 in words is "six hundred forty-five billion, two hundred sixty million, six hundred forty-three thousand, five hundred forty-five".