2640261563 has 8 divisors (see below), whose sum is σ = 2796177408. Its totient is φ = 2487772584.

The previous prime is 2640261553. The next prime is 2640261583. The reversal of 2640261563 is 3651620462.

It is a happy number.

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 2640261563 - 2²⁰ = 2639212987 is a prime.

It is a super-2 number, since 2×2640261563² = 13941962242110405938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640261553) 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, 855131 + ... + 858212.

It is an arithmetic number, because the mean of its divisors is an integer number (349522176).

Almost surely, 2^2640261563 is an apocalyptic number.

2640261563 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2640261563 is a deficient number, since it is larger than the sum of its proper divisors (155915845).

2640261563 is a wasteful number, since it uses less digits than its factorization.

2640261563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713433.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2640261563 is about 51383.4755831094. The cubic root of 2640261563 is about 1382.1302887129.

The spelling of 2640261563 in words is "two billion, six hundred forty million, two hundred sixty-one thousand, five hundred sixty-three".