1661406414 has 8 divisors (see below), whose sum is σ = 3322812840. Its totient is φ = 553802136.

The previous prime is 1661406401. The next prime is 1661406427. The reversal of 1661406414 is 4146041661.

It is an interprime number because it is at equal distance from previous prime (1661406401) and next prime (1661406427).

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

1661406414 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138450529 + ... + 138450540.

It is an arithmetic number, because the mean of its divisors is an integer number (415351605).

Almost surely, 2^1661406414 is an apocalyptic number.

1661406414 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661406414 is a wasteful number, since it uses less digits than its factorization.

1661406414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276901074.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1661406414 is about 40760.3534577413. The cubic root of 1661406414 is about 1184.3824430895.

The spelling of 1661406414 in words is "one billion, six hundred sixty-one million, four hundred six thousand, four hundred fourteen".