1366631421 has 8 divisors (see below), whose sum is σ = 1822881984. Its totient is φ = 910734240.

The previous prime is 1366631419. The next prime is 1366631423. The reversal of 1366631421 is 1241366631.

It is an interprime number because it is at equal distance from previous prime (1366631419) and next prime (1366631423).

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

It is not a de Polignac number, because 1366631421 - 2¹ = 1366631419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366631423) 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, 79185 + ... + 94886.

It is an arithmetic number, because the mean of its divisors is an integer number (227860248).

Almost surely, 2^1366631421 is an apocalyptic number.

It is an amenable number.

1366631421 is a deficient number, since it is larger than the sum of its proper divisors (456250563).

1366631421 is a wasteful number, since it uses less digits than its factorization.

1366631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176691.

The product of its digits is 15552, while the sum is 33.

The square root of 1366631421 is about 36967.9783190804. The cubic root of 1366631421 is about 1109.7295071763.

The spelling of 1366631421 in words is "one billion, three hundred sixty-six million, six hundred thirty-one thousand, four hundred twenty-one".