1671644741 has 12 divisors (see below), whose sum is σ = 1811289348. Its totient is φ = 1542063744.

The previous prime is 1671644729. The next prime is 1671644771. The reversal of 1671644741 is 1474461761.

It can be written as a sum of positive squares in 6 ways, for example, as 693268900 + 978375841 = 26330^2 + 31279^2 .

It is not a de Polignac number, because 1671644741 - 2⁶ = 1671644677 is a prime.

It is a super-2 number, since 2×1671644741² = 5588792280225914162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671644701) 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, 453281 + ... + 456953.

It is an arithmetic number, because the mean of its divisors is an integer number (150940779).

Almost surely, 2^1671644741 is an apocalyptic number.

It is an amenable number.

1671644741 is a deficient number, since it is larger than the sum of its proper divisors (139644607).

1671644741 is a wasteful number, since it uses less digits than its factorization.

1671644741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392 (or 6379 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 1671644741 is about 40885.7522983251. The cubic root of 1671644741 is about 1186.8103601384.

The spelling of 1671644741 in words is "one billion, six hundred seventy-one million, six hundred forty-four thousand, seven hundred forty-one".