2640140152786 has 8 divisors (see below), whose sum is σ = 3961426146300. Its totient is φ = 1319664770688.

The previous prime is 2640140152757. The next prime is 2640140152787. The reversal of 2640140152786 is 6872510410462.

It can be written as a sum of positive squares in 2 ways, for example, as 2554943299561 + 85196853225 = 1598419^2 + 291885^2 .

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 (2640140152787) 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, 202644711 + ... + 202657738.

Almost surely, 2^{2640140152786} is an apocalyptic number.

2640140152786 is a deficient number, since it is larger than the sum of its proper divisors (1321285993514).

2640140152786 is a wasteful number, since it uses less digits than its factorization.

2640140152786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405305708.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 2640140152786 in words is "two trillion, six hundred forty billion, one hundred forty million, one hundred fifty-two thousand, seven hundred eighty-six".