545549690657 has 4 divisors (see below), whose sum is σ = 546923871636. Its totient is φ = 544175509680.

The previous prime is 545549690639. The next prime is 545549690663. The reversal of 545549690657 is 756096945545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756096945545 = 5 ⋅151219389109.

It can be written as a sum of positive squares in 2 ways, for example, as 140658001936 + 404891688721 = 375044^2 + 636311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545549690657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 545549690593 and 545549690602.

It is not an unprimeable number, because it can be changed into a prime (545549690557) 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, 687089894 + ... + 687090687.

It is an arithmetic number, because the mean of its divisors is an integer number (136730967909).

Almost surely, 2^545549690657 is an apocalyptic number.

It is an amenable number.

545549690657 is a deficient number, since it is larger than the sum of its proper divisors (1374180979).

545549690657 is a wasteful number, since it uses less digits than its factorization.

545549690657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374180978.

The product of its (nonzero) digits is 204120000, while the sum is 65.

The spelling of 545549690657 in words is "five hundred forty-five billion, five hundred forty-nine million, six hundred ninety thousand, six hundred fifty-seven".