2640654775 has 48 divisors (see below), whose sum is σ = 3676907520. Its totient is φ = 1864886400.

The previous prime is 2640654773. The next prime is 2640654781. The reversal of 2640654775 is 5774560462.

It is not a de Polignac number, because 2640654775 - 2¹ = 2640654773 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640654773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1500346 + ... + 1502104.

It is an arithmetic number, because the mean of its divisors is an integer number (76602240).

Almost surely, 2^2640654775 is an apocalyptic number.

2640654775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2640654775 is a deficient number, since it is larger than the sum of its proper divisors (1036252745).

2640654775 is a wasteful number, since it uses less digits than its factorization.

2640654775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 46.

The square root of 2640654775 is about 51387.3016902036. The cubic root of 2640654775 is about 1382.1988984856.

The spelling of 2640654775 in words is "two billion, six hundred forty million, six hundred fifty-four thousand, seven hundred seventy-five".