2643778502 has 4 divisors (see below), whose sum is σ = 3965667756. Its totient is φ = 1321889250.

The previous prime is 2643778483. The next prime is 2643778513. The reversal of 2643778502 is 2058773462.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660944624 + ... + 660944627.

It is an arithmetic number, because the mean of its divisors is an integer number (991416939).

Almost surely, 2^2643778502 is an apocalyptic number.

2643778502 is a deficient number, since it is larger than the sum of its proper divisors (1321889254).

2643778502 is a wasteful number, since it uses less digits than its factorization.

2643778502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321889253.

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 2643778502 is about 51417.6866651933. The cubic root of 2643778502 is about 1382.7437015764.

The spelling of 2643778502 in words is "two billion, six hundred forty-three million, seven hundred seventy-eight thousand, five hundred two".