645201106642 has 16 divisors (see below), whose sum is σ = 993217447872. Its totient is φ = 314231314320.

The previous prime is 645201106633. The next prime is 645201106651. The reversal of 645201106642 is 246601102546.

It is an interprime number because it is at equal distance from previous prime (645201106633) and next prime (645201106651).

It is a super-2 number, since 2×645201106642² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25659928 + ... + 25685059.

It is an arithmetic number, because the mean of its divisors is an integer number (62076090492).

Almost surely, 2^645201106642 is an apocalyptic number.

645201106642 is a deficient number, since it is larger than the sum of its proper divisors (348016341230).

645201106642 is a wasteful number, since it uses less digits than its factorization.

645201106642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51345153.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 645201106642 in words is "six hundred forty-five billion, two hundred one million, one hundred six thousand, six hundred forty-two".