1661313601456 has 20 divisors (see below), whose sum is σ = 3218960428704. Its totient is φ = 830614136000.

The previous prime is 1661313601399. The next prime is 1661313601457. The reversal of 1661313601456 is 6541063131661.

It is not an unprimeable number, because it can be changed into a prime (1661313601457) 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, 2344120 + ... + 2969431.

Almost surely, 2^{1661313601456} is an apocalyptic number.

1661313601456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661313601456 is a deficient number, since it is larger than the sum of its proper divisors (1557646827248).

1661313601456 is a wasteful number, since it uses less digits than its factorization.

1661313601456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333100 (or 5333094 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 1661313601456 in words is "one trillion, six hundred sixty-one billion, three hundred thirteen million, six hundred one thousand, four hundred fifty-six".