2465218781 has 4 divisors (see below), whose sum is σ = 2465374464. Its totient is φ = 2465063100.

The previous prime is 2465218757. The next prime is 2465218799. The reversal of 2465218781 is 1878125642.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2465218781 is a prime.

It is a super-2 number, since 2×2465218781² = 12154607276390251922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2465218741) 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, 51005 + ... + 86786.

It is an arithmetic number, because the mean of its divisors is an integer number (616343616).

Almost surely, 2^2465218781 is an apocalyptic number.

It is an amenable number.

2465218781 is a deficient number, since it is larger than the sum of its proper divisors (155683).

2465218781 is a wasteful number, since it uses less digits than its factorization.

2465218781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155682.

The product of its digits is 215040, while the sum is 44.

The square root of 2465218781 is about 49650.9695877130. The cubic root of 2465218781 is about 1350.8853417092.

The spelling of 2465218781 in words is "two billion, four hundred sixty-five million, two hundred eighteen thousand, seven hundred eighty-one".