1466023621 has 4 divisors (see below), whose sum is σ = 1466494092. Its totient is φ = 1465553152.

The previous prime is 1466023589. The next prime is 1466023627. The reversal of 1466023621 is 1263206641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1263206641 = 17 ⋅74306273.

It can be written as a sum of positive squares in 2 ways, for example, as 1455041025 + 10982596 = 38145^2 + 3314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1466023621 - 2⁵ = 1466023589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1466023627) 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, 230530 + ... + 236803.

It is an arithmetic number, because the mean of its divisors is an integer number (366623523).

Almost surely, 2^1466023621 is an apocalyptic number.

It is an amenable number.

1466023621 is a deficient number, since it is larger than the sum of its proper divisors (470471).

1466023621 is an equidigital number, since it uses as much as digits as its factorization.

1466023621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470470.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1466023621 is about 38288.6878986470. The cubic root of 1466023621 is about 1136.0052085678.

The spelling of 1466023621 in words is "one billion, four hundred sixty-six million, twenty-three thousand, six hundred twenty-one".