2648778497 has 4 divisors (see below), whose sum is σ = 2649339840. Its totient is φ = 2648217156.

The previous prime is 2648778487. The next prime is 2648778523. The reversal of 2648778497 is 7948778462.

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 2648778497 - 2⁸ = 2648778241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2648778437) 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, 273533 + ... + 283050.

It is an arithmetic number, because the mean of its divisors is an integer number (662334960).

Almost surely, 2^2648778497 is an apocalyptic number.

It is an amenable number.

2648778497 is a deficient number, since it is larger than the sum of its proper divisors (561343).

2648778497 is an equidigital number, since it uses as much as digits as its factorization.

2648778497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561342.

The product of its digits is 37933056, while the sum is 62.

The square root of 2648778497 is about 51466.2850514781. The cubic root of 2648778497 is about 1383.6148483950.

The spelling of 2648778497 in words is "two billion, six hundred forty-eight million, seven hundred seventy-eight thousand, four hundred ninety-seven".