1618561277057 has 4 divisors (see below), whose sum is σ = 1619016316116. Its totient is φ = 1618106238000.

The previous prime is 1618561276993. The next prime is 1618561277077. The reversal of 1618561277057 is 7507721658161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 721668939121 + 896892337936 = 849511^2 + 947044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618561277057 - 2⁶ = 1618561276993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1618561276993 and 1618561277011.

It is not an unprimeable number, because it can be changed into a prime (1618561277077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227514194 + ... + 227521307.

It is an arithmetic number, because the mean of its divisors is an integer number (404754079029).

Almost surely, 2^{1618561277057} is an apocalyptic number.

It is an amenable number.

1618561277057 is a deficient number, since it is larger than the sum of its proper divisors (455039059).

1618561277057 is an equidigital number, since it uses as much as digits as its factorization.

1618561277057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455039058.

The product of its (nonzero) digits is 4939200, while the sum is 56.

The spelling of 1618561277057 in words is "one trillion, six hundred eighteen billion, five hundred sixty-one million, two hundred seventy-seven thousand, fifty-seven".