1642168749 has 16 divisors (see below), whose sum is σ = 2361127104. Its totient is φ = 1009219200.

The previous prime is 1642168729. The next prime is 1642168751. The reversal of 1642168749 is 9478612461.

It is not a de Polignac number, because 1642168749 - 2²⁴ = 1625391533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1642168698 and 1642168707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642168729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2014 + ... + 57344.

It is an arithmetic number, because the mean of its divisors is an integer number (147570444).

Almost surely, 2^1642168749 is an apocalyptic number.

It is an amenable number.

1642168749 is a deficient number, since it is larger than the sum of its proper divisors (718958355).

1642168749 is a wasteful number, since it uses less digits than its factorization.

1642168749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56108.

The product of its digits is 580608, while the sum is 48.

The square root of 1642168749 is about 40523.6813357326. The cubic root of 1642168749 is about 1179.7933059876.

The spelling of 1642168749 in words is "one billion, six hundred forty-two million, one hundred sixty-eight thousand, seven hundred forty-nine".