1661593419 has 12 divisors (see below), whose sum is σ = 2488971576. Its totient is φ = 1107728784.

The previous prime is 1661593399. The next prime is 1661593463. The reversal of 1661593419 is 9143951661.

1661593419 is a `hidden beast` number, since 16 + 6 + 1 + 593 + 41 + 9 = 666.

1661593419 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1661593419 - 2²⁴ = 1644816203 is a prime.

It is a super-2 number, since 2×1661593419² = 5521785380128219122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661593819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3418674 + ... + 3419159.

It is an arithmetic number, because the mean of its divisors is an integer number (207414298).

Almost surely, 2^1661593419 is an apocalyptic number.

1661593419 is a deficient number, since it is larger than the sum of its proper divisors (827378157).

1661593419 is an frugal number, since it uses more digits than its factorization.

1661593419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837848 (or 6837836 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 1661593419 is about 40762.6473502397. The cubic root of 1661593419 is about 1184.4268787610.

The spelling of 1661593419 in words is "one billion, six hundred sixty-one million, five hundred ninety-three thousand, four hundred nineteen".