2491138266938 has 8 divisors (see below), whose sum is σ = 3956513718132. Its totient is φ = 1172300360896.

The previous prime is 2491138266937. The next prime is 2491138266941. The reversal of 2491138266938 is 8396628311942.

It can be written as a sum of positive squares in 2 ways, for example, as 2491103492329 + 34774609 = 1578323^2 + 5897^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2491138266937) 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, 36634386245 + ... + 36634386312.

Almost surely, 2^{2491138266938} is an apocalyptic number.

2491138266938 is a deficient number, since it is larger than the sum of its proper divisors (1465375451194).

2491138266938 is a wasteful number, since it uses less digits than its factorization.

2491138266938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73268772576.

The product of its digits is 26873856, while the sum is 62.

The spelling of 2491138266938 in words is "two trillion, four hundred ninety-one billion, one hundred thirty-eight million, two hundred sixty-six thousand, nine hundred thirty-eight".