1661616460431 has 12 divisors (see below), whose sum is σ = 2401133585760. Its totient is φ = 1107273112800.

The previous prime is 1661616460403. The next prime is 1661616460451. The reversal of 1661616460431 is 1340646161661.

1661616460431 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 6 + 1 + 6 + 4 + 604 + 31 = 666.

It is not a de Polignac number, because 1661616460431 - 2¹⁹ = 1661615936143 is a prime.

It is a super-2 number, since 2×1661616460431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661616460451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39243846 + ... + 39286163.

It is an arithmetic number, because the mean of its divisors is an integer number (200094465480).

Almost surely, 2^{1661616460431} is an apocalyptic number.

1661616460431 is a deficient number, since it is larger than the sum of its proper divisors (739517125329).

1661616460431 is a wasteful number, since it uses less digits than its factorization.

1661616460431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78532366 (or 78532363 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 1661616460431 in words is "one trillion, six hundred sixty-one billion, six hundred sixteen million, four hundred sixty thousand, four hundred thirty-one".