2640605616251 has 8 divisors (see below), whose sum is σ = 2788612323840. Its totient is φ = 2495365389352.

The previous prime is 2640605616223. The next prime is 2640605616263. The reversal of 2640605616251 is 1526165060462.

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

It is a cyclic number.

It is not a de Polignac number, because 2640605616251 - 2³⁸ = 2365727709307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640605613251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691618211 + ... + 691622028.

It is an arithmetic number, because the mean of its divisors is an integer number (348576540480).

Almost surely, 2^{2640605616251} is an apocalyptic number.

2640605616251 is a deficient number, since it is larger than the sum of its proper divisors (148006707589).

2640605616251 is a wasteful number, since it uses less digits than its factorization.

2640605616251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383240345.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 2640605616251 in words is "two trillion, six hundred forty billion, six hundred five million, six hundred sixteen thousand, two hundred fifty-one".