2666219401 has 4 divisors (see below), whose sum is σ = 2673484672. Its totient is φ = 2658954132.

The previous prime is 2666219399. The next prime is 2666219447. The reversal of 2666219401 is 1049126662.

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 not a de Polignac number, because 2666219401 - 2¹ = 2666219399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2666219471) 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, 3632085 + ... + 3632818.

It is an arithmetic number, because the mean of its divisors is an integer number (668371168).

Almost surely, 2^2666219401 is an apocalyptic number.

It is an amenable number.

2666219401 is a deficient number, since it is larger than the sum of its proper divisors (7265271).

2666219401 is an equidigital number, since it uses as much as digits as its factorization.

2666219401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7265270.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 2666219401 is about 51635.4471366328. The cubic root of 2666219401 is about 1386.6450151932.

The spelling of 2666219401 in words is "two billion, six hundred sixty-six million, two hundred nineteen thousand, four hundred one".