2640754749338 has 4 divisors (see below), whose sum is σ = 3961132124010. Its totient is φ = 1320377374668.

The previous prime is 2640754749319. The next prime is 2640754749433. The reversal of 2640754749338 is 8339474570462.

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

It can be written as a sum of positive squares in only one way, i.e., 2485752697129 + 155002052209 = 1576627^2 + 393703^2 .

It is a super-2 number, since 2×2640754749338² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660188687333 + ... + 660188687336.

Almost surely, 2^{2640754749338} is an apocalyptic number.

2640754749338 is a deficient number, since it is larger than the sum of its proper divisors (1320377374672).

2640754749338 is a wasteful number, since it uses less digits than its factorization.

2640754749338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320377374671.

The product of its (nonzero) digits is 121927680, while the sum is 62.

The spelling of 2640754749338 in words is "two trillion, six hundred forty billion, seven hundred fifty-four million, seven hundred forty-nine thousand, three hundred thirty-eight".