1661310406 has 48 divisors (see below), whose sum is σ = 2996617680. Its totient is φ = 688289280.

The previous prime is 1661310389. The next prime is 1661310407. The reversal of 1661310406 is 6040131661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661310407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 452205 + ... + 455863.

It is an arithmetic number, because the mean of its divisors is an integer number (62429535).

Almost surely, 2^1661310406 is an apocalyptic number.

1661310406 is a deficient number, since it is larger than the sum of its proper divisors (1335307274).

1661310406 is a wasteful number, since it uses less digits than its factorization.

1661310406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829 (or 3822 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1661310406 is about 40759.1757276812. The cubic root of 1661310406 is about 1184.3596286075.

The spelling of 1661310406 in words is "one billion, six hundred sixty-one million, three hundred ten thousand, four hundred six".