1405055661 has 8 divisors (see below), whose sum is σ = 1983608064. Its totient is φ = 881603520.

The previous prime is 1405055591. The next prime is 1405055693. The reversal of 1405055661 is 1665505041.

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

It is not a de Polignac number, because 1405055661 - 2¹¹ = 1405053613 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405055261) 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, 13775005 + ... + 13775106.

It is an arithmetic number, because the mean of its divisors is an integer number (247951008).

Almost surely, 2^1405055661 is an apocalyptic number.

It is an amenable number.

1405055661 is a deficient number, since it is larger than the sum of its proper divisors (578552403).

1405055661 is a wasteful number, since it uses less digits than its factorization.

1405055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27550131.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1405055661 is about 37484.0720973589. The cubic root of 1405055661 is about 1120.0339224951.

The spelling of 1405055661 in words is "one billion, four hundred five million, fifty-five thousand, six hundred sixty-one".