645246955617 has 16 divisors (see below), whose sum is σ = 939120093120. Its totient is φ = 390817483200.

The previous prime is 645246955597. The next prime is 645246955627. The reversal of 645246955617 is 716559642546.

645246955617 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645246955617 - 2¹¹ = 645246953569 is a prime.

It is a super-3 number, since 3×645246955617³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (645246955627) 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, 5977642 + ... + 6084627.

It is an arithmetic number, because the mean of its divisors is an integer number (58695005820).

Almost surely, 2^645246955617 is an apocalyptic number.

It is an amenable number.

645246955617 is a deficient number, since it is larger than the sum of its proper divisors (293873137503).

645246955617 is a wasteful number, since it uses less digits than its factorization.

645246955617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12063904.

The product of its digits is 54432000, while the sum is 60.

The spelling of 645246955617 in words is "six hundred forty-five billion, two hundred forty-six million, nine hundred fifty-five thousand, six hundred seventeen".