645541137293 has 32 divisors (see below), whose sum is σ = 722900505600. Its totient is φ = 572356947456.

The previous prime is 645541137253. The next prime is 645541137299. The reversal of 645541137293 is 392731145546.

It is not a de Polignac number, because 645541137293 - 2³⁴ = 628361268109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645541137299) 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, 126400646 + ... + 126405752.

It is an arithmetic number, because the mean of its divisors is an integer number (22590640800).

Almost surely, 2^645541137293 is an apocalyptic number.

It is an amenable number.

645541137293 is a deficient number, since it is larger than the sum of its proper divisors (77359368307).

645541137293 is a wasteful number, since it uses less digits than its factorization.

645541137293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821.

The product of its digits is 2721600, while the sum is 50.

The spelling of 645541137293 in words is "six hundred forty-five billion, five hundred forty-one million, one hundred thirty-seven thousand, two hundred ninety-three".