2643782542 has 4 divisors (see below), whose sum is σ = 3965673816. Its totient is φ = 1321891270.

The previous prime is 2643782539. The next prime is 2643782549. The reversal of 2643782542 is 2452873462.

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

It is a super-2 number, since 2×2643782542² = 13979172258767963528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643782549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660945634 + ... + 660945637.

It is an arithmetic number, because the mean of its divisors is an integer number (991418454).

Almost surely, 2^2643782542 is an apocalyptic number.

2643782542 is a deficient number, since it is larger than the sum of its proper divisors (1321891274).

2643782542 is a wasteful number, since it uses less digits than its factorization.

2643782542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321891273.

The product of its digits is 645120, while the sum is 43.

The square root of 2643782542 is about 51417.7259512709. The cubic root of 2643782542 is about 1382.7444059070.

The spelling of 2643782542 in words is "two billion, six hundred forty-three million, seven hundred eighty-two thousand, five hundred forty-two".