645623460545 has 32 divisors (see below), whose sum is σ = 890850105600. Its totient is φ = 440004337920.

The previous prime is 645623460541. The next prime is 645623460563. The reversal of 645623460545 is 545064326546.

It is not a de Polignac number, because 645623460545 - 2² = 645623460541 is a prime.

It is a super-2 number, since 2×645623460545² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645623460493 and 645623460502.

It is not an unprimeable number, because it can be changed into a prime (645623460541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10885631 + ... + 10944779.

It is an arithmetic number, because the mean of its divisors is an integer number (27839065800).

Almost surely, 2^645623460545 is an apocalyptic number.

It is an amenable number.

645623460545 is a deficient number, since it is larger than the sum of its proper divisors (245226645055).

645623460545 is a wasteful number, since it uses less digits than its factorization.

645623460545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61065.

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

The spelling of 645623460545 in words is "six hundred forty-five billion, six hundred twenty-three million, four hundred sixty thousand, five hundred forty-five".