2638216761 has 8 divisors (see below), whose sum is σ = 3517925184. Its totient is φ = 1758659760.

The previous prime is 2638216751. The next prime is 2638216769. The reversal of 2638216761 is 1676128362.

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

It is not a de Polignac number, because 2638216761 - 2³⁰ = 1564474937 is a prime.

It is a super-2 number, since 2×2638216761² = 13920375356042662242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2638216769) 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, 12291 + ... + 73671.

It is an arithmetic number, because the mean of its divisors is an integer number (439740648).

Almost surely, 2^2638216761 is an apocalyptic number.

It is an amenable number.

2638216761 is a deficient number, since it is larger than the sum of its proper divisors (879708423).

2638216761 is a wasteful number, since it uses less digits than its factorization.

2638216761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75711.

The product of its digits is 145152, while the sum is 42.

The square root of 2638216761 is about 51363.5742623116. The cubic root of 2638216761 is about 1381.7733906527.

The spelling of 2638216761 in words is "two billion, six hundred thirty-eight million, two hundred sixteen thousand, seven hundred sixty-one".