2640262361 has 4 divisors (see below), whose sum is σ = 2880286224. Its totient is φ = 2400238500.

The previous prime is 2640262357. The next prime is 2640262369. The reversal of 2640262361 is 1632620462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2640262361 - 2² = 2640262357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640262369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120011915 + ... + 120011936.

It is an arithmetic number, because the mean of its divisors is an integer number (720071556).

Almost surely, 2^2640262361 is an apocalyptic number.

It is an amenable number.

2640262361 is a deficient number, since it is larger than the sum of its proper divisors (240023863).

2640262361 is a wasteful number, since it uses less digits than its factorization.

2640262361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240023862.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 2640262361 is about 51383.4833482511. The cubic root of 2640262361 is about 1382.1304279591.

The spelling of 2640262361 in words is "two billion, six hundred forty million, two hundred sixty-two thousand, three hundred sixty-one".