645630454777 has 32 divisors (see below), whose sum is σ = 835262613504. Its totient is φ = 484467782400.

The previous prime is 645630454723. The next prime is 645630454823. The reversal of 645630454777 is 777454036546.

It is a happy number.

It is not a de Polignac number, because 645630454777 - 2²³ = 645622066169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645630454477) 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, 1138128 + ... + 1608289.

It is an arithmetic number, because the mean of its divisors is an integer number (26101956672).

Almost surely, 2^645630454777 is an apocalyptic number.

It is an amenable number.

645630454777 is a deficient number, since it is larger than the sum of its proper divisors (189632158727).

645630454777 is a wasteful number, since it uses less digits than its factorization.

645630454777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746549.

The product of its (nonzero) digits is 59270400, while the sum is 58.

The spelling of 645630454777 in words is "six hundred forty-five billion, six hundred thirty million, four hundred fifty-four thousand, seven hundred seventy-seven".