645156614773 has 4 divisors (see below), whose sum is σ = 703807216128. Its totient is φ = 586506013420.

The previous prime is 645156614747. The next prime is 645156614797. The reversal of 645156614773 is 377416651546.

645156614773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645156614773 - 2¹⁷ = 645156483701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645156614723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29325300661 + ... + 29325300682.

It is an arithmetic number, because the mean of its divisors is an integer number (175951804032).

Almost surely, 2^645156614773 is an apocalyptic number.

It is an amenable number.

645156614773 is a deficient number, since it is larger than the sum of its proper divisors (58650601355).

645156614773 is a wasteful number, since it uses less digits than its factorization.

645156614773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58650601354.

The product of its digits is 12700800, while the sum is 55.

The spelling of 645156614773 in words is "six hundred forty-five billion, one hundred fifty-six million, six hundred fourteen thousand, seven hundred seventy-three".