645421542007 has 16 divisors (see below), whose sum is σ = 708042092544. Its totient is φ = 583460892000.

The previous prime is 645421541993. The next prime is 645421542011. The reversal of 645421542007 is 700245124546.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645421542007 is a prime.

It is a super-3 number, since 3×645421542007³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645421542097) 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, 5821582 + ... + 5931412.

It is an arithmetic number, because the mean of its divisors is an integer number (44252630784).

Almost surely, 2^645421542007 is an apocalyptic number.

645421542007 is a deficient number, since it is larger than the sum of its proper divisors (62620550537).

645421542007 is a wasteful number, since it uses less digits than its factorization.

645421542007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112830.

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 645421542007 in words is "six hundred forty-five billion, four hundred twenty-one million, five hundred forty-two thousand, seven".