2547452478665 has 4 divisors (see below), whose sum is σ = 3056942974404. Its totient is φ = 2037961982928.

The previous prime is 2547452478661. The next prime is 2547452478677. The reversal of 2547452478665 is 5668742547452.

It is a happy number.

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 1239935698576 + 1307516780089 = 1113524^2 + 1143467^2 .

It is a cyclic number.

It is not a de Polignac number, because 2547452478665 - 2² = 2547452478661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2547452478661) 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, 254745247862 + ... + 254745247871.

It is an arithmetic number, because the mean of its divisors is an integer number (764235743601).

Almost surely, 2^{2547452478665} is an apocalyptic number.

It is an amenable number.

2547452478665 is a deficient number, since it is larger than the sum of its proper divisors (509490495739).

2547452478665 is an equidigital number, since it uses as much as digits as its factorization.

2547452478665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509490495738.

The product of its digits is 451584000, while the sum is 65.

The spelling of 2547452478665 in words is "two trillion, five hundred forty-seven billion, four hundred fifty-two million, four hundred seventy-eight thousand, six hundred sixty-five".