6401203645 has 16 divisors (see below), whose sum is σ = 8121378240. Its totient is φ = 4830050304.

The previous prime is 6401203639. The next prime is 6401203649. The reversal of 6401203645 is 5463021046.

It is a cyclic number.

It is not a de Polignac number, because 6401203645 - 2²⁵ = 6367649213 is a prime.

It is a super-2 number, since 2×6401203645² = 81950816209522572050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401203649) 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, 126852 + ... + 169981.

It is an arithmetic number, because the mean of its divisors is an integer number (507586140).

Almost surely, 2^6401203645 is an apocalyptic number.

It is an amenable number.

6401203645 is a deficient number, since it is larger than the sum of its proper divisors (1720174595).

6401203645 is a wasteful number, since it uses less digits than its factorization.

6401203645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297084.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6401203645 is about 80007.5224275818. The cubic root of 6401203645 is about 1856.7519183408.

The spelling of 6401203645 in words is "six billion, four hundred one million, two hundred three thousand, six hundred forty-five".